2024 NSCA CSCS Exam Chapter 1 Latest Questions With Complete Grade A Answers
- 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
- Arrival of the action potential at the nerve terminal causes release of a
neurotransmitter, , which diffuses across the neuromuscular junction. Once a sufficient amount is released, an action potential is generated across the sarcolemma, and the (muscle)fiber contracts.Answer acetylcholine
- Actin and Myosin
Answer: contractile proteins in muscle
- / 2
- 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 ventric ular relaxation (diastole)
- Arterial System
Answer: Carries blood away from the heart
- Arteriole
Answer: small branches of arteries that act as control vessels through which blood enters the capillaries. Play a major role in the regulation of blood flow to the extremeities.
- Artery
Answer: Their function is to rapidly transport blood pumped from the heart.
- Atrioventricular (AV) Bundle
Answer: conducts the electrical impulse to the ventricles
- Atrioventricular (AV) Node
Answer: electrical impulses coming from the SA node are delayed slightly here
before passing into the ventricles
- / 2