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The amount of air that stays in the lungs even after a forceful exhale is known as residual volume (Correct Option). It is essential for keeping the alveoli from fully collapsing. The alveoli remain open and retain their structural integrity because of the residual volume, which keeps some air in them. This is essential for the lungs’ ongoing gas exchange, particularly during exhalation when the chest pressure rises. The typical range is 1000–1500 ml.

A bacterial, viral, or fungal infection of one or both lungs is known as pneumonia. Pus and other liquids fill the air sacs in this dangerous infection. One or more lung segments, or lobes, are impacted by lobar pneumonia.

The protein molecule in red blood cells called hemoglobin transports oxygen from the lungs to the body’s tissues. The normal oxygen saturation level in healthy people is around 20 milliliters of oxygen per 100 milliliters of blood, which is the maximum amount of oxygen that hemoglobin can absorb at sea level.

Air passes through your larynx (voice box), down your pharynx (back of your throat), and into your trachea (windpipe) when you breathe in through your mouth or nose. The two airways that make up your trachea are known as bronchial tubes. Your left lung is served by one bronchial tube, while your right lung is served by the other.

The leading cause of lung cancer is smoking. Roughly 90% of cases of lung cancer are caused by it. Numerous chemicals found in tobacco smoke have been linked to lung cancer. The best thing you can do for your lung health, if you still smoke, is to stop.

Compared to an equivalent volume of air, water contains less oxygen. Less than “10 ml” of oxygen are present in one liter of water.

Carbon dioxide diffuses into the blood from the tissues as systemic arterial blood passes through capillaries. The blood contains some dissolved carbon dioxide. Haemoglobin and some carbon dioxide combine to form carbaminohaemoglobin. Bicarbonate and hydrogen ions are produced from the residual carbon dioxide. The majority of carbon dioxide is carried by the blood as bicarbonate ions.

The volume of air that enters or exits the lungs during each respiratory cycle is known as the tidal volume. In a healthy adult, it is approximately 500 ml.

This is the only appropriate choice because nasal mucus serves to shield your airway from bacteria, viruses, and irritants like dust and debris that could otherwise enter your lungs and nasal passages. Additionally, it moistens and warms incoming air.

Lungs are covered by pleural membranes. The ‘pleura’ are thin, double-layered membrane sacs that cover the lung.

The production and secretion of mucus is the main job of goblet cells.

The respiratory passageway is unrelated to the pleural cells that line the pleural cavity. The alveoli are lined with surfactant cells, which release surfactant, a crucial substance whose primary job is to lower surface tension. Goblet cells and ciliated cells are the two types of tracheal cells. Tracheal cells include ciliated cells in addition to those that secrete mucus.

The larynx at the top of the trachea contains the vocal folds, also referred to as the vocal cords. During inhalation, they are open, and during swallowing and phonation, they come together to close.

A genetic (inherited) condition known as cystic fibrosis (CF) results in the accumulation of thick, sticky mucus in organs such as the pancreas and lungs. Thick mucus obstructs the airways in CF patients, making breathing challenging. The pancreatic duct and lungs are both obstructed, which stops the digestive enzymes from being secreted. Because these enzymes begin to break down the pancreas, their buildup inside the organ is harmful. Furthermore, mucus in males obstructs the sperm duct, making the male sterile.

D is accurate since the pleural membrane, a thin, double-layered membrane, envelops the lungs. During breathing, pleural membranes are crucial for lubricating and lowering friction between bodily parts.

Many arachnids, including spiders and scorpions, have book lungs, a type of respiration organ used for atmospheric gas exchange. For the purposes of respiration, each of these organs is housed inside an open, air-filled ventral abdominal cavity (atrium) that is connected to the outside world by a tiny aperture.

The first stage of breathing is called inspiration, during which we take in air.

The bronchiole is the section of the respiratory system with the smallest diameter and the thinnest wallwall. Alveoli are where bronchioles, which are branches of bronchi, terminate. They are mostly encircled by smooth muscle and elastic fibers and lack hyaline cartilage.

Breathing out causes the chest’s volume to decrease as the diaphragm rises and the ribs move inward and downward. The reverse of these motions involves upward and outward rib movements and an increase in chest volume.

Your body uses more oxygen and generates more carbon dioxide when you exercise and your muscles work harder. Your breathing must increase from around 15 times per minute (12 liters of air) when you are at rest to about 30 to 40 times per minute (100 liters of air) when you are exercising in order to meet this additional demand.

This is the right response. d) “Allergic reaction of the mast cells in the lungs” The activation of mast cells in the lungs is a common cause of asthma, which is frequently linked to allergic reactions. Mast cells release chemicals, such as IgE antibodies and chemicals like seratonin and histamines, in response to allergens or irritants. These substances can cause bronchoconstriction, airway inflammation, and the usual symptoms of asthma. People with asthma experience an allergic reaction in their airways when they are exposed to allergens (like dust mites, pollen, or pet dander) or irritants (like smoke or strong odors).

People of all ages can develop asthma, a chronic lung condition. Breathing becomes more difficult due to inflammation and tightness in the muscles surrounding the airways.

Cilia beat the mucus produced by goblet cells, which traps the dust particles. Cilia’s continuous ciliary movement keeps dust particles out of the airways. Gases such as carbon dioxide, carbon monoxide, and oxygen cannot be eliminated by cilia.

Nostrils: These are the facial openings to the nasal cavities. These apertures allow air to enter the nasal cavity.

Since bronchioles are known to lack cartilage, choices A and C are untrue. Option B is also incorrect because alveoli do not require goblet cells because they do not contain mucus. Goblet cells are mucus secretory cells in the gas exchange system. The right response, option D, is now available.

The diaphragm, muscles, and ribs surround the chest cavity.

The stem apex and embryo tips serve as the stimulus receptor whenever vernalization takes place in mature plants. Stated differently, the bud’s meristematic cells react to the cold treatment.

Mucous membranes line the glottis because it is a component of the upper respiratory tract.

An average adult human has a total lung capacity of about 5 liters when their lungs are fully inflated. However, this can change based on a number of variables, including height, age, gender, and general health.

The ribs are moved upward and outward by the contraction of the intercostal muscles during inhalation, which increases the thoracic volume.

The greatest death rate is from lung cancer.

Because it lines the alveoli to reduce surface tension and avoid atelectasis during breathing, pulmonary surfactant is vital to life. Four surfactant-associated proteins (SP-A, SP-B, SP-C, and SP-D) and a relatively unique phospholipid (dipalmitoylphosphatidylcholine) are found in abundance in surfactant.

The moisture in our lungs and respiratory system causes water vapor to be released into the air when we exhale. When this warm, humid air comes into contact with a cold surface, it can cause water droplets to form. This is because water vapor condenses into microscopic droplets on the surface as the air temperature drops.

About 20–25% of CO2 is carried by red blood cells, while 70% is carried as bicarbonate. Approximately 7% of CO2 is transported through plasma in a dissolved state. The enzyme carbonic anhydrase is found in very high concentrations in red blood cells (RBCs), and trace amounts are also found in plasma. The following reaction is facilitated in both directions by this enzyme. As CO2 diffuses into blood (RBCs and plasma) at the tissue site where the partial pressure of CO2 is high because of catabolism, it forms HCO3 and H+. When this HCO3 reacts with Na+, sodium bicarbonate is created. The reaction proceeds in the opposite direction at the alveolar site where pCO2 is low, forming CO2 and H2O.

The ‘Lenticel’ structure, which promotes transpiration and gaseous exchange, is depicted in the figure. Woody tree bark contains these aerating pores. Complementary cells with thin walls that are loosely arranged enclose these, creating intercellular spaces for gaseous exchange.

Bone projections from the internal nose wall create three passageways within each nasal cavity. The vestibule, respiratory, and olfactory sections comprise the nasal cavity.

Specialized cells called guard cells are present in the leaf epidermis and surround and control the opening and closing of stomata, which are microscopic gas exchange pores that function as multisensory hydraulic valves.

The thoracic cavity expands during inspiration, or inhalation. The diaphragm and external intercostal muscles are contracted to accomplish this. When the external intercostal muscles contract, the diaphragm descends and the rib cage enlarges. These activities cause the thoracic cavity’s volume to increase, which lowers the pressure inside the lungs. Breathing is made easier by this negative pressure, which draws air into the lungs.

When the diaphragm contracts during inspiration, its dome shape flattens, while the rib cage moves forward and upward when the external intercostal contracts and the internal intercostal relaxes. The thoracic cavity’s inner space expands as a result of these two occurrences. As a result, the pressure in the lungs and thorax is lowered below atmospheric pressure. The thorax’s volume rises as its pressure falls (NBF, page 9). Option E is therefore the right response.

Lung cancer, emphysema, and chronic bronchitis are among the respiratory conditions that smoking is the primary cause of. Hazardous chemicals found in tobacco smoke harm the respiratory system and raise the chance of contracting these illnesses.

The inner walls of the air sacs are weakened in emphysema, which leads to their eventual rupture. As a result, the surface area available for gas exchange is decreased and one larger air space is created rather than numerous smaller ones. Emphysema is primarily brought on by prolonged exposure to airborne irritants. Because of inflammation and airway tightening, asthma causes the lungs’ airways to narrow. The bacterial infection that causes tuberculosis spreads through microscopic droplets from an infected person’s cough or sneeze. Gene mutation is the cause of cancer.

The right response, in short, is “a) Dorsal.” The dorsal (back) portion of the brainstem contains the medulla’s expiratory center. The expiratory center’s location is not accurately represented by the other options.

Acute and chronic bronchitis are the two forms of the illness.

“Breathing” is the process by which animals absorb oxygen (O2) from the atmosphere and expel carbon dioxide (CO2) into it. It cannot be “respiration” because glucose is broken down to provide energy during cellular respiration. It cannot be “osmosis” or “diffusion” because both entail the passage of substances across a gradient of concentration.
During respiration, the animals take in oxygen and exhale carbon dioxide. In living things, respiration is the process by which energy is produced, usually through the intake of oxygen and the expulsion of carbon dioxide from the oxidation of complex organic substances.

Since there are two types of bronchitis—acute and chronic—option A is the right one. A virus is typically the cause of acute bronchitis. One kind of chronic lung disease is chronic bronchitis.

Because it involves the breakdown of alveolar elastic tissue, which in turn causes the breakdown of alveolar walls and the formation of large pockets within the lungs, emphysema is the right answer.

The hemoglobin does not bind oxygen as well if the blood’s pH is lower than normal (normal physiological pH is 7.4). In other words, the Bohr effect states that the lower the pH, the more hydrogen ions there are, the higher the carbon dioxide level, and the lower the hemoglobin’s affinity for oxygen. Conversely, a higher pH results in a lower concentration of H+ ions, a lower level of carbon dioxide, and a greater affinity for oxygen by hemoglobin.

‘Windpipe’ is another term for the trachea.

The lining of the digestive and respiratory systems contains unicellular glands called goblet cells. These cells release mucus, a slimy, sticky material that lubricates and shields the organ lining from pathogens and mechanical harm. Mucus in the respiratory tract keeps dust, bacteria, and other foreign objects from getting into the lungs. Mucus lubricates the food bolus and makes it easier for it to pass through the digestive tract.

It is simpler to rule out options B and C.

To help you remember why histoplasmosis must be eradicated, use the figure below.

It is simpler to rule out options B and C.

To help you remember why histoplasmosis must be eradicated, use the figure below.

The medulla oblongata contains the respiratory centers that regulate inspiration and expiration (Correct Option):: This is true. The medulla oblongata contains the main respiratory centers that regulate inspiration (inhalation) and expiration (exhalation). In order to guarantee that the body gets enough oxygen and gets rid of extra carbon dioxide, these centers assist in controlling the depth and rhythm of breathing.

Because of the lungs’ elasticity, air expands actively during inspiration and contracts passively during expiration.

The walls of bronchioles, which transport air to tiny sacs in your lungs called alveoli, are made of ciliated cuboidal epithelium and a layer of smooth muscle. They are about 1 mm in diameter or less.

As bicarbonate ions (Correct Option): Bicarbonate ions (HCO3-) carry about 70% of the carbon dioxide (CO2) that is absorbed by the blood. This is the main way that CO2 is transported through the blood. In a chemical reaction, CO2 and water (H2O) combine to form carbonic acid (H2CO3), which quickly splits into hydrogen (H+) and bicarbonate (HCO3-) ions. The bloodstream subsequently transports this bicarbonate ion to the lungs for excretion.

Air passes through your larynx (voice box), down your pharynx (back of your throat), and into your trachea (windpipe) when you breathe in through your mouth or nose. The two airways that make up your trachea are known as bronchial tubes. Your left lung is served by one bronchial tube, while your right lung is served by the other.

The epiglottis is a tiny, leaf-shaped piece of elastic cartilage that aids in swallowing and shields your larynx, or voice box.

The carbon dioxide content of exhaled air is 4.4%.

When the lungs are filled with the same amount of CO2 as blood, the gas stays in the blood and continues to rise. As oxygen is inhaled, CO2 diffuses out of the lungs. Holding your breath causes carbon dioxide to build up in your cells, blood, and lungs. This irritates your body and causes the respiratory center part of your brain to send out impulses to breathe and respire. Additionally, this increase in CO2 makes us drowsy. Hb’s affinity for O2 is reduced as a result of increasing CO2 tension. As a result, breathing gets deeper and faster as blood CO2 levels rise.

The heme-associated iron binds oxygen.

We breathe in and out 15–20 times per minute while at rest. The breathing rate may increase to 30 times per minute while exercising.

People who have moved from the planes to an area at a higher altitude have more red blood cells and their hemoglobin has a lower binding affinity to oxygen, so this option is accurate.

The goblet cells, which are mucus-secreting cells found in the tracheal and digestive tube epithelium, are the most prevalent unicellular exocrine glands.

Smoking damages the lungs’ alveoli, which are tiny air sacs that permit the exchange of oxygen. Some of those air sacs are harmed when you smoke. You have irreversibly damaged a portion of your lungs when you destroy alveoli because they cannot regrow. Emphysema develops when enough alveoli are destroyed.

To safeguard and keep the airway open, the trachea’s anterior and lateral sides are reinforced by C-shaped cartilaginous rings. (The trachea can slightly collapse to allow food to pass down the esophagus because the cartilaginous rings are incomplete.)

Between the pharynx and trachea are the glottis and larynx, or voice box.

The goblet cells are exocrine glands with only one cell. The intestinal and respiratory tracts’ epithelial linings are dotted with goblet cells. They produce a barrier of mucus and secrete mucin.

Compared to hemoglobin, myoglobin has a greater affinity for oxygen. Additionally, myoglobin is found in muscle tissues as opposed to hemoglobin, which is found in red blood cells. As a result, hemoglobin benefits greatly from its lower affinity for oxygen since it makes it easier for the protein to release oxygen within cells. However, myoglobin will be much less likely to release oxygen once it is bound because it has a much higher affinity for it.

Premature infants who have not yet produced enough surfactant in their lungs are the main victims of respiratory distress syndrome (RDS). Their lungs’ increased surface tension makes it more difficult for them to expand and adequately fill with air. This causes shallow breathing and respiratory difficulties, which can lead to serious breathing issues and inadequate blood oxygenation.

The big airways that link the trachea and lungs are called bronchi.

Since the trachea transports air from the larynx to the bronchi, it is also referred to as the windpipe. For this reason, Option D is the right response.

(d) The net movement of a material from an area of greater concentration to an area of lower concentration is known as diffusion. The difference in partial pressure of respiratory gases causes the exchange of gases between the lung’s alveoli and blood. O 2 diffuses quickly from the alveolar air into the blood of the alveolar capillaries because the partial pressure of oxygen (pO 2) in the alveolar air is higher than the pO 2 of the blood in the alveolar capillaries. Blood that enters the alveolar capillaries has a higher pCO 2 than alveolar air. CO 2 into the alveolar air as a result.

The trachea is a tube made of membranes. It is made up of smooth muscle and dense, regular tissue that are strengthened by 15–20 C-shaped pieces of cartilage. Another name for it is a windpipe. D is therefore the right choice.

The pleural membrane would eventually be damaged as a result, which would upset the gas pressure balance and cause the lungs to collapse. Consequently, the man would eventually pass away.

The infectious viral infection known as “acute bronchitis” results in inflammation of the bronchial tubes, which are the airways that supply air to your lungs. These tubes swell and develop mucus, or thick fluid, when they become infected. Breathing becomes more difficult as a result of the airways becoming narrowed. However, its effects are reversible, and it lasts for a few weeks. Option A is therefore accurate.

Hemoglobin and plasma are the two forms of oxygen that are carried in the blood. Compared to plasma, hemoglobin carries 70 times as much oxygen.

Breathing is a surface phenomenon and a mechanical process.

At sea level, normal human blood can absorb and carry up to 20 milliliters of oxygen per 100 milliliters of blood. When hemoglobin is completely oxygenated, it can hold this much oxygen.

Since hemoglobin is 98% saturated at an oxygen tension of 115 mm mercury, there are 19.6 (approximately 20) milliliters of oxygen per 100 milliliters of blood.

It is synonymous with the air sac, which is believed to be the lungs’ functional unit.

The surface where gas exchange actually occurs is known as the respiratory surface. The alveoli are the respiratory surface in humans. Option B is therefore the right choice.

An agent that lowers the surface tension between two media is called a surfactant. A thin layer of fluid called pulmonary surfactant reduces the surface tension between the gaseous and aqueous interphase in the lungs. It is made up of proteins and lipids.

Since carbon dioxide and oxygen cannot penetrate the cuticle, they enter and exit leaves through stomata, which are holes (stoma = “hole”). The opening and closing of stomata is regulated by guard cells. The plant releases water vapor into the atmosphere when its stomata are open, allowing gases to pass through the leaf surface.

When an adult human’s lungs are fully expanded, their internal volume is approximately five liters. (PTB)