Which of the following substances acts at the NMJ to excite the muscle fibers of a motor
unit?
acetylcholine
ATP
creatine phosphate
serotonin - ANS-acetylcholine
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?
From which of the following is the heart's electrical impulse normally initiated?
AV node
SA node
the brain
the sympathetic nervous system - ANS-SA node
Which of the following occurs during the QRS complex of a typical ECG?
1. depolarization of the atrium
2. repolarization of the atrium
3. repolarization of the ventricle
4. depolarization of the ventricle
a. 1 and 3 only
,b. 2 and 4 only
c. 1, 2, and 3 only
d. 2, 3, and 4 only - ANS-b. 2 and 4 only
Which of the following is the definition of power?
mass x acceleration
force x distance
force x velocity
torque x time - ANS-force x velocity
To compare performances of Olympic weightlifters of different body weights, the classic
formula divides the load lifted by the athlete's
body weight
body weight squared
lean body weight
body weight to the two-thirds power - ANS-body weight to the two-thirds power
During a free weight exercise, muscle force varies with which of the following?
1. perpendicular distance from the weight to the body joint
2. joint angle
3. movement acceleration
4. movement velocity squared
a. 1 and 2 only
b. 1 and 4 only
c. 1, 2, and 3 only
d. 2, 3, and 4 only - ANS-a. 1 and 2 only (perpendicular distance from the weight to the
body joint AND joint angle)
A vertical jump involves knee, hip, and shoulder movement primarily in which of the
following anatomical planes?
, An athlete is performing a concentric isokinetic elbow flexion and extension exercise.
Which of the following type(s) of lever occur(s) at the elbow during this exercise?
1. 1st class
2. 2nd class
3. 3rd class
a. 1 only
b. 2 only
c. 1 and 3 only
d. 2 and 3 only - ANS-c. 1 and 3 only
Which of the following substances can be metabolized anaerobically?
Which of the following reactions is the primary cause of metabolic acidosis (decrease in
intramuscular pH during high-intensity, fatiguing exercise)?
ATP = ADP + Pi + H+
pyruvate + NADH = lactate + NAD+
ADP + creatine phosphate = ATP + creatine
fructose-6-phosphate = fructose-1,6-biphosphate - ANS-ATP = ADP + Pi + H+
Which of the following energy systems produces ATP at the quickest rate?
phosphagen
aerobic glycolysis
fat oxidation
fast glycolysis - ANS-phosphagen
Approximately how many net ATP are produced via the oxidative energy system from
the metabolism of one molecule?
27
34
38
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