CSCS CSCS: Structure & Function of Body System 3

Question 1

Which hormone is primarily responsible for stimulating the reabsorption of sodium in the kidney's distal tubule?

Accepted Answer

Aldosterone

Answer

Aldosterone, secreted by the adrenal cortex, promotes sodium reabsorption in the distal convoluted tubule and collecting duct to regulate fluid balance.

Question 2

The sliding filament theory of muscle contraction states that muscle shortening occurs because:

Accepted Answer

Actin filaments slide over myosin filaments, reducing sarcomere length

Answer

During contraction, myosin cross-bridges pull actin filaments toward the center of the sarcomere, reducing sarcomere length without changing filament lengths.

Question 3

Which joint type allows the greatest range of motion in multiple planes?

Accepted Answer

Ball-and-socket joint

Answer

Ball-and-socket joints (e.g., hip and shoulder) allow movement in all three planes, providing the greatest overall range of motion.

Question 4

The aorta exits from which chamber of the heart?

Accepted Answer

Left ventricle

Answer

The aorta, the largest artery in the body, arises from the left ventricle and carries oxygenated blood to the systemic circulation.

Question 5

Which term describes the movement of decreasing the angle at a joint?

Accepted Answer

Flexion

Answer

Flexion decreases the angle between body segments at a joint, such as bending the elbow or knee.

Certified Strength and Conditioning Specialist Practice Test

Certified Strength and Conditioning Specialist Practice Test

CSCS CSCS: Structure & Function of Body System 3