NSCA-CPT Human Anatomy and Physiology Diagnostic 4 — Questions and Answers
Question 1: What term describes the maximum volume of blood the heart can pump per minute?
- Stroke volume
- Cardiac output (Correct answer)
- Ejection fraction
- End-diastolic volume
Correct answer: Cardiac output
Cardiac output (Q) equals heart rate multiplied by stroke volume and represents the total volume of blood pumped by the heart each minute.
Question 2: Which muscle group is the primary mover during knee extension?
- Hamstrings
- Gluteus medius
- Quadriceps femoris (Correct answer)
- Gastrocnemius
Correct answer: Quadriceps femoris
The quadriceps femoris group (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius) concentrically produces knee extension.
Question 3: The epiphyseal plate in long bones is responsible for which physiological process?
- Producing red blood cells
- Longitudinal bone growth (Correct answer)
- Synthesizing cortical bone density
- Producing synovial fluid
Correct answer: Longitudinal bone growth
The epiphyseal (growth) plate is a cartilaginous zone where chondrocytes proliferate and calcify, enabling long bones to increase in length during development.
Question 4: Which neuromuscular reflex, when activated, causes a muscle to suddenly relax to prevent injury from excessive tension?
- Stretch reflex
- Crossed extensor reflex
- Golgi tendon organ (GTO) reflex (Correct answer)
- Withdrawal reflex
Correct answer: Golgi tendon organ (GTO) reflex
The GTO reflex (autogenic inhibition) activates Ib afferents when tension is excessive, sending inhibitory signals to motor neurons causing the muscle to relax.
Question 5: Oxygen is transported in the blood primarily by binding to which molecule inside red blood cells?
- Myoglobin
- Albumin
- Hemoglobin (Correct answer)
- Ferritin
Correct answer: Hemoglobin
Hemoglobin, an iron-containing protein in red blood cells, binds approximately 98% of all oxygen transported in the blood.
Question 6: Which joint type allows the greatest range of motion in multiple planes and is found at the hip and shoulder?
- Hinge joint
- Pivot joint
- Saddle joint
- Ball-and-socket joint (Correct answer)
Correct answer: Ball-and-socket joint
Ball-and-socket joints (diarthroses) permit flexion, extension, abduction, adduction, rotation, and circumduction due to their spherical articular surface.
Question 7: During aerobic exercise, which energy system primarily sustains activity beyond approximately 2–3 minutes?
- ATP-PCr (phosphagen) system
- Fast glycolysis
- Oxidative phosphorylation (Correct answer)
- Anaerobic glycolysis
Correct answer: Oxidative phosphorylation
Oxidative phosphorylation uses oxygen in mitochondria to produce large amounts of ATP from carbohydrates and fats, supporting prolonged aerobic activities.
NSCA-CPT Human Anatomy and Physiology Diagnostic 4
What term describes the maximum volume of blood the heart can pump per minute?