Question

Posterior Cricoarytenoids

a) Skeletal muscle
b) Smooth muscle
c) Cardiac muscle
d) Striated muscle

Answer 1

The posterior cricoarytenoid muscle is a skeletal muscle responsible for opening the vocal cords during inhalation.

Step-by-step explanation:

The posterior cricoarytenoid muscle is a part of the larynx and is responsible for opening the vocal cords during inhalation. It is a skeletal muscle, meaning it is under voluntary control and is attached to bones. Skeletal muscles, like the posterior cricoarytenoid muscle, have a long and cylindrical shape with multiple nuclei and dark nuclei pushed to the periphery of the cell.

Answer 2

The Posterior Cricoarytenoids are classified as a type of skeletal muscle because they are striated and under voluntary control, matching the characteristics of skeletal muscle tissue.

Step-by-step explanation:

The Posterior Cricoarytenoids are a type of muscle in the human body involved in the process of respiration, specifically in opening the vocal cords. Concerning its classification, it is important to identify the correct type of muscle tissue. Based on the characteristics of muscle tissues provided, we can determine the classification of Posterior Cricoarytenoids:

• Skeletal muscle tissue is composed of cells that are long, cylindrical, have multiple nuclei, and appear striated or striped due to the arrangement in bundles.
• Smooth muscle cells are short, have one nucleus each, and do not show a striated pattern because the cells are arranged in sheets.
• Cardiac muscle tissue is found only in the heart, has cells that may have one or two nuclei, and also shows a striated pattern due to the arrangement of sarcomeres.

Given that the Posterior Cricoarytenoids are striated and under voluntary control, which is a characteristic of skeletal muscle, the answer is:

(a) Skeletal muscle.