100% CORRECT ANSWERS|LATEST
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
1
, acetylcholine - ANSWER 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.
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
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.
2
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
1
, acetylcholine - ANSWER 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.
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
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.
2
