Generate Quiz 69ABEDAB79CBF

The human body has many different kinds of joints, including syndesmosis, which joins bones to one another. It’s the type of joint where the fibrous membrane connects the log bones. The joint between the ulna and radius, two long bones of the forearm, and the tibia and fibula, two long bones of the leg, are two instances of syndesmosis.

Large pectoralis muscles, which depress the wings at the shoulder, are the main source of power for birds’ flight. Take a look at the picture below:

A motor neuron and a skeletal muscle fiber are connected at the neuromuscular junction. Acetylcholine, a neurotransmitter released by a stimulated motor neuron, attaches to receptors on the muscle fiber to cause muscle contraction. Individual motor neurons are able to precisely control muscle fibers thanks to this one-to-one relationship.

“Sarco-” literally translates to “muscle.” When discussing normal cell biology, this prefix is used to show that the term has something to do with muscles. However, the suffix ‘-lemma’ denotes a “confining membrane”; for instance, the membrane of a muscle cell is called sarcolemma, whereas the membrane of a normal cell is simply called the plasma membrane. For this reason, we reject option B. Since the term “sarcoplasm” refers to the cytoplasm of a striated muscle cell, we also reject option C. Sarcomeres, a muscle’s functional units, make up myofibrils. The myofibril’s job is to use the sliding filament model to contract muscles.

Heart muscle cells are characterized by four features: they are mononucleated, branched, striated, and involuntary. Because parts of the brain stem and hypothalamus control the heart muscle subconsciously, it is regarded as an involuntary tissue. Since the cardiac muscle’s characteristic is listed as voluntary but involuntary, option A is the right response.

Light and dark bands make up each sarcomere. Actin and myosin filaments make up these bands.

Together, the adductors are in charge of stabilizing the pelvis during more controlled activities like walking and bringing the legs inward toward one another (adduction) when the leg is extended. ‘Abduction’ is the movement of a body part away from the midline, either of the hand or foot or of the body as a whole. ‘Abductor muscles’ are the muscles that make this movement.

According to the majority of sources, the human body contains more than 600 named skeletal muscles.

The organism uses pseudopodia to move. Option E is the best choice because of this. A pseudopodium is a transient projection of a eukaryotic cell membrane that resembles an arm and develops in the direction of the organism’s movement.

Smooth muscles are represented by Option A. The walls of internal organs like the stomach, intestine, bladder, etc., are made of smooth muscles. These muscles are not striated and cannot be controlled voluntarily. Thus, this is the right choice.