Generate Quiz 69ABEC46C5D45

Thick myosin and thin actin filaments are both present in the A band, a region of a muscle sarcomere. Under a microscope, it appears dark and shows the entire length of the sarcomere’s thick filaments.

The human neck contains seven cervical vertebrae.

The gliding joints of the vertebral body are made to support weight. The intervertebral disc connects the articular surfaces, which are covered in hyaline cartilage.

Since the myosin head attaches to ATP and assumes a high energy configuration to attach to the myosin-binding site on the actin filaments, option B is accurate.

Since “fibrocartilage” is present in some synovial joints and the intervertebral discs, Option D is accurate.

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:

The space between two Z lines is called a sarcomere.

There are 22 bones in the human skull. These bones comprise eight cranial bones (frontal, a pair of parietal, a pair of temporal, occipital, sphenoid, and ethmoid) and fourteen facial bones (maxilla, mandible, vomer, nasal, zygomatic, conchae, lacrimal, and palatine).

Key 22 is the right response according to the NUMS. The six earbones are not part of the 22 bones that make up the skull. But according to the STB, it’s 28; you should stick with your textbook.

Each thick filament in a sarcomere is surrounded by six thin filaments. Actin-based thin filaments are in charge of interacting with thick filaments during muscle contraction.

The muscle’s contractile unit is called a sarcomere. During muscle contraction, a sarcomere’s thick and thin filaments overlap. Thick filaments make up the A band, whereas thin filaments make up the I band. Thin filaments extend in both directions from the Z-line, which crosses the center of the I band. It indicates the sarcomere’s border.