Question

question 9

the wall of the heart is primarily made of:

a a) skeletal muscle
b b) cardiac muscle
c c) smooth muscle
d d) fibrous connective tissue

Explanation:

Identify the primary tissue of the heart wall

The wall of the heart consists of three layers: the epicardium (outer protective layer), the myocardium (middle muscular layer), and the endocardium (inner lining). The myocardium is by far the thickest layer and is composed of specialized cardiac muscle tissue responsible for pumping blood.

Evaluate the given options

• a) Skeletal muscle is voluntary muscle attached to bones.
• b) Cardiac muscle is involuntary, striated muscle found exclusively in the heart wall.
• c) Smooth muscle is involuntary, non-striated muscle found in the walls of hollow organs like blood vessels and intestines.
• d) Fibrous connective tissue is present in the heart valves and skeleton but does not make up the bulk of the wall.

Therefore, the heart wall is primarily made of cardiac muscle.

Answer:

• A a) skeletal muscle
• B b) cardiac muscle (Correct answer)
• C c) smooth muscle
• D d) fibrous connective tissue