NSCA-CPT Human Anatomy and Physiology Diagnostic 5

Question 1

Which spinal vertebral region has the greatest inherent stability due to its articulation with the rib cage?

Accepted Answer

Thoracic

Answer

The thoracic spine is stabilized by the rib cage and costovertebral joints, significantly limiting range of motion compared to the cervical or lumbar regions.

Question 2

The sliding filament theory of muscle contraction describes the interaction between which two proteins?

Accepted Answer

Actin and myosin

Answer

Actin (thin filaments) and myosin (thick filaments) slide past each other when myosin heads form cross-bridges with actin, shortening the sarcomere.

Question 3

Which metabolic byproduct accumulates in muscle during intense anaerobic glycolysis and contributes to fatigue?

Accepted Answer

Hydrogen ions (H+)

Answer

It is the accumulation of hydrogen ions (H+) — not lactate itself — that lowers intracellular pH and impairs muscle contractile function during high-intensity exercise.

Question 4

The femoral nerve innervates which primary muscle group?

Accepted Answer

Quadriceps femoris

Answer

The femoral nerve (L2–L4) innervates the quadriceps femoris group and provides sensory innervation to the anterior thigh and medial leg.

Question 5

Which layer of connective tissue directly surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Answer

The endomysium is the innermost connective tissue layer, composed of reticular fibers that directly ensheath each individual muscle fiber.

NSCA-CPT Exam Practice Test

NSCA-CPT Exam Practice Test

NSCA-CPT Human Anatomy and Physiology Diagnostic 5