2026-2027 NSCA CSCS EXAM ACTUAL NEWEST
VERSION
2026-2027 ACTUAL QUESTION AND CORRECT
DETAILED VERIFIED ANSWERS FROM VERIFIED
SOURCES BY EXPERT RATED A GRADE.
In which of the following athletes might you expect limited bone mineral
density (BMD) levels as a consequence of the force vectors and the
physical demands associated with the given sport?
A. 16-year-old gymnast with a seven-year training history in her sport
B. 23-year-old offensive lineman who has lifted weights for eight years
C. 22-year-old track cyclist who has a 1RM of 352 lbs
D. 19-year-old 800m freestyle swimmer with one year of dryland training
CORRECT ANS: D. 19-year-old 800m freestyle swimmer with one year of
dryland training.
Expert Rationale: Bone mineral density (BMD) is influenced by the
mechanical loading and weight-bearing nature of the sport. Swimmers,
particularly those who have limited dryland (land-based) training, are at risk
for lower BMD because swimming is a non-weight-bearing activity that does
not provide the necessary osteogenic stimulus to promote bone density. The
gymnast (A) performs high-impact, weight-bearing activities that promote
bone density. The offensive lineman (B) engages in heavy resistance training,
which provides high mechanical loading. The track cyclist (C) also engages in
significant lower-body loading. The swimmer, with only one year of dryland
training, has the least mechanical loading and is most likely to have limited
BMD.
,A 17-year-old high school cross-country runner has been training
aerobically for six months in preparation for the upcoming season. Which
of the following adaptations will occur in the muscles during that time?
A. Increased concentration of glycolytic enzymes
B. Hyperplasia of Type II fibers
C. Transformation from Type I to Type II fibers
D. Hypertrophy of Type I fibers
CORRECT ANS: D. Hypertrophy of Type I fibers.
Expert Rationale: Aerobic endurance training, such as long-distance
running, leads to specific muscular adaptations that enhance oxidative
capacity. A key adaptation is the hypertrophy (increase in size) of Type I
(slow-twitch, oxidative) muscle fibers, which are highly fatigue-resistant and
suited for sustained activity. This hypertrophy is accompanied by increases
in capillary density, mitochondrial number, and oxidative enzymes.
Glycolytic enzymes are more associated with anaerobic training.
Hyperplasia (increase in fiber number) is not a typical adaptation in humans.
Type I fibers are not transformed into Type II; there is some evidence of fiber
type shifting, but not from I to II as a result of aerobic training.
The amount of blood ejected from the left ventricle during each beat is the
_____
A. cardiac output
B. a-v O2 difference
C. heart rate
D. stroke volume
CORRECT ANS: D. stroke volume.
Expert Rationale: Stroke volume (SV) is the volume of blood pumped by the
left ventricle per beat. It is a key determinant of cardiac output (SV x HR).
Cardiac output (A) is the total volume of blood pumped per minute. The a-v
,O2 difference (B) is the difference in oxygen content between arterial and
venous blood. Heart rate (C) is the number of beats per minute.
Which of the following does NOT normally increase during an aerobic
exercise session?
A. End-diastolic volume
B. Cardiac contractility
C. Cardiac output
D. Diastolic blood pressure
CORRECT ANS: D. Diastolic blood pressure.
Expert Rationale: During dynamic aerobic exercise, diastolic blood pressure
(DBP) typically remains relatively unchanged or may even slightly decrease
due to vasodilation of the peripheral arterioles, which reduces peripheral
resistance. End-diastolic volume (A) increases due to increased venous
return. Cardiac contractility (B) and cardiac output (C) both increase to meet
the metabolic demands of the working muscles. DBP is the only variable that
does not normally increase.
Which of the following substances regulates muscle actions?
A. Potassium
B. Calcium
C. Troponin
D. Tropomyosin
CORRECT ANS: B. Calcium.
Expert Rationale: Calcium (Ca2+) is the key regulatory ion for muscle
contraction. It binds to troponin, which causes a conformational change that
moves tropomyosin away from the myosin-binding sites on actin, allowing
cross-bridge formation to occur. Potassium (A) is important for membrane
, potential but does not directly regulate contraction. Troponin (C) and
tropomyosin (D) are structural proteins that are part of the regulatory
complex, but calcium is the initiating substance that regulates their action.
Which of the following substances acts at the NMJ to excite the muscle
fibers of a motor unit?
A. Acetylcholine
B. ATP
C. Creatine phosphate
D. Serotonin
CORRECT ANS: A. Acetylcholine.
Expert Rationale: The neuromuscular junction (NMJ) is the synapse
between a motor neuron and a muscle fiber. Acetylcholine (ACh) is the
neurotransmitter that is released from the motor neuron, crosses the
synaptic cleft, and binds to receptors on the muscle fiber's sarcolemma. This
binding triggers an action potential in the muscle fiber, leading to excitation-
contraction coupling. ATP (B) is the energy source. Creatine phosphate (C) is
an energy storage molecule. Serotonin (D) is a neurotransmitter in the
central nervous system.
When throwing a baseball, an athlete's arm is rapidly stretched just before
throwing the ball. Which of the following structures detects and responds
to that stretch by reflexively increasing muscle activity?
A. Golgi tendon organ
B. Muscle spindle
C. Extrafusal muscle
D. Pacinian corpuscle
CORRECT ANS: B. Muscle spindle.
VERSION
2026-2027 ACTUAL QUESTION AND CORRECT
DETAILED VERIFIED ANSWERS FROM VERIFIED
SOURCES BY EXPERT RATED A GRADE.
In which of the following athletes might you expect limited bone mineral
density (BMD) levels as a consequence of the force vectors and the
physical demands associated with the given sport?
A. 16-year-old gymnast with a seven-year training history in her sport
B. 23-year-old offensive lineman who has lifted weights for eight years
C. 22-year-old track cyclist who has a 1RM of 352 lbs
D. 19-year-old 800m freestyle swimmer with one year of dryland training
CORRECT ANS: D. 19-year-old 800m freestyle swimmer with one year of
dryland training.
Expert Rationale: Bone mineral density (BMD) is influenced by the
mechanical loading and weight-bearing nature of the sport. Swimmers,
particularly those who have limited dryland (land-based) training, are at risk
for lower BMD because swimming is a non-weight-bearing activity that does
not provide the necessary osteogenic stimulus to promote bone density. The
gymnast (A) performs high-impact, weight-bearing activities that promote
bone density. The offensive lineman (B) engages in heavy resistance training,
which provides high mechanical loading. The track cyclist (C) also engages in
significant lower-body loading. The swimmer, with only one year of dryland
training, has the least mechanical loading and is most likely to have limited
BMD.
,A 17-year-old high school cross-country runner has been training
aerobically for six months in preparation for the upcoming season. Which
of the following adaptations will occur in the muscles during that time?
A. Increased concentration of glycolytic enzymes
B. Hyperplasia of Type II fibers
C. Transformation from Type I to Type II fibers
D. Hypertrophy of Type I fibers
CORRECT ANS: D. Hypertrophy of Type I fibers.
Expert Rationale: Aerobic endurance training, such as long-distance
running, leads to specific muscular adaptations that enhance oxidative
capacity. A key adaptation is the hypertrophy (increase in size) of Type I
(slow-twitch, oxidative) muscle fibers, which are highly fatigue-resistant and
suited for sustained activity. This hypertrophy is accompanied by increases
in capillary density, mitochondrial number, and oxidative enzymes.
Glycolytic enzymes are more associated with anaerobic training.
Hyperplasia (increase in fiber number) is not a typical adaptation in humans.
Type I fibers are not transformed into Type II; there is some evidence of fiber
type shifting, but not from I to II as a result of aerobic training.
The amount of blood ejected from the left ventricle during each beat is the
_____
A. cardiac output
B. a-v O2 difference
C. heart rate
D. stroke volume
CORRECT ANS: D. stroke volume.
Expert Rationale: Stroke volume (SV) is the volume of blood pumped by the
left ventricle per beat. It is a key determinant of cardiac output (SV x HR).
Cardiac output (A) is the total volume of blood pumped per minute. The a-v
,O2 difference (B) is the difference in oxygen content between arterial and
venous blood. Heart rate (C) is the number of beats per minute.
Which of the following does NOT normally increase during an aerobic
exercise session?
A. End-diastolic volume
B. Cardiac contractility
C. Cardiac output
D. Diastolic blood pressure
CORRECT ANS: D. Diastolic blood pressure.
Expert Rationale: During dynamic aerobic exercise, diastolic blood pressure
(DBP) typically remains relatively unchanged or may even slightly decrease
due to vasodilation of the peripheral arterioles, which reduces peripheral
resistance. End-diastolic volume (A) increases due to increased venous
return. Cardiac contractility (B) and cardiac output (C) both increase to meet
the metabolic demands of the working muscles. DBP is the only variable that
does not normally increase.
Which of the following substances regulates muscle actions?
A. Potassium
B. Calcium
C. Troponin
D. Tropomyosin
CORRECT ANS: B. Calcium.
Expert Rationale: Calcium (Ca2+) is the key regulatory ion for muscle
contraction. It binds to troponin, which causes a conformational change that
moves tropomyosin away from the myosin-binding sites on actin, allowing
cross-bridge formation to occur. Potassium (A) is important for membrane
, potential but does not directly regulate contraction. Troponin (C) and
tropomyosin (D) are structural proteins that are part of the regulatory
complex, but calcium is the initiating substance that regulates their action.
Which of the following substances acts at the NMJ to excite the muscle
fibers of a motor unit?
A. Acetylcholine
B. ATP
C. Creatine phosphate
D. Serotonin
CORRECT ANS: A. Acetylcholine.
Expert Rationale: The neuromuscular junction (NMJ) is the synapse
between a motor neuron and a muscle fiber. Acetylcholine (ACh) is the
neurotransmitter that is released from the motor neuron, crosses the
synaptic cleft, and binds to receptors on the muscle fiber's sarcolemma. This
binding triggers an action potential in the muscle fiber, leading to excitation-
contraction coupling. ATP (B) is the energy source. Creatine phosphate (C) is
an energy storage molecule. Serotonin (D) is a neurotransmitter in the
central nervous system.
When throwing a baseball, an athlete's arm is rapidly stretched just before
throwing the ball. Which of the following structures detects and responds
to that stretch by reflexively increasing muscle activity?
A. Golgi tendon organ
B. Muscle spindle
C. Extrafusal muscle
D. Pacinian corpuscle
CORRECT ANS: B. Muscle spindle.
