NSCA-CSCS Exam Chapter 1; Questions &
Answers 100% Solved
To what structures do the cross-bridges attach during muscle action? Answer-Actin
Which substance regulates muscle actions? Answer-Calcium
Which substance acts at the neuromuscular junction to excite the muscle fibers of a motor unit?
...
NSCA-CSCS Exam Chapter 1; Questions &
Answers 100% Solved
To what structures do the cross-bridges attach during muscle action? Answer-Actin
Which substance regulates muscle actions? Answer-Calcium
Which substance acts at the neuromuscular junction to excite the muscle fibers of a motor unit?
Answer-Acetylcholine
Which muscle fiber type is the MOST beneficial for a marathon runner? Answer-Type I
When throwing a baseball, an athlete's arm is rapidly stretched just prior to throwing the ball.
Which of the following structures detects and responds to that stretch by reflexively increasing
muscle activity? Answer-Muscle Spindle
From what is the heart's electrical impulse normally initiated? Answer-SA Node
Which of the following occurs during the QRS complex of a typical ECG? Answer-
repolarization of the atrium and depolarization of the ventricle.
A-Band Answer-overlapping actin and myosin
acetylcholine Answer-Arrival of the action potential at the nerve terminal causes release
of a neurotransmitter, ______, which diffuses across the neuromuscular junction. Once a
, NSCA-CSCS Exam Chapter 1; Questions &
Answers 100% Solved
sufficient amount is released, an action potential is generated across the sarcolemma, and the
(muscle)fiber contracts.
Actin and Myosin Answer-contractile proteins in muscle
Action potential Answer-the change in electrical potential associated with the passage of
an impulse along the membrane of a muscle cell or nerve cell.
All-or-none Principle Answer-the strength by which a nerve or muscle fiber responds to a
stimulus is independent of the strength of the stimulus. If the stimulus exceeds the threshold
potential, the nerve or muscle fiber will give a complete response; otherwise, there is no
response.
Alveolar Pressure Answer-the pressure in centimeters of water pressure (cmH2O) held
within the alveoli of the lungs during inspiration. The pressure value is the difference from
atmospheric pressure, which is considered zero when establishing the value.
Alveoli Answer-where gases are exchanged in respiration.
Aortic Valve Answer-prevents backflow from the aorta into the ventricles during
ventricular relaxation (diastole)
Arterial System Answer-Carries blood away from the heart
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