CSCS CSCS: Structure & Function of Body System 4

Question 1

During the Valsalva maneuver, intra-abdominal pressure increases primarily to:

Accepted Answer

Stabilize the spine and trunk during maximal lifts

Answer

The Valsalva maneuver increases intra-abdominal and intrathoracic pressure, creating a rigid core that supports the spine against compressive forces during heavy lifts.

Question 2

Which proprioceptor is located within the muscle belly and detects changes in muscle length?

Accepted Answer

Muscle spindle

Answer

Muscle spindles (intrafusal fibers) are length-sensitive mechanoreceptors embedded in the muscle belly that detect stretch and mediate the myotatic (stretch) reflex.

Question 3

What percentage of cardiac output does the heart receive at rest?

Accepted Answer

4–5%

Answer

The coronary circulation receives approximately 4–5% of total cardiac output at rest to supply the myocardium with oxygen and nutrients.

Question 4

Which of the following bones is classified as a sesamoid bone?

Accepted Answer

Patella

Answer

The patella is the largest sesamoid bone in the body, embedded within the quadriceps tendon to improve mechanical advantage of the extensor mechanism.

Question 5

The stretch-shortening cycle (SSC) is most closely associated with which type of muscle action sequence?

Accepted Answer

Eccentric followed by concentric

Answer

The SSC involves a rapid eccentric (lengthening) phase immediately followed by a concentric (shortening) phase, enhancing force production through elastic energy storage and neural potentiation.

Certified Strength and Conditioning Specialist Practice Test

Certified Strength and Conditioning Specialist Practice Test

CSCS CSCS: Structure & Function of Body System 4