Exam #2 Multiple Choice Questions Correct 100%
A normal resting heart rate is determined by
a. the parasympathetic nervous system
b. the sympathetic nervous system
c. neither the parasympathetic nor the sympathetic nervous system
d. a combination of parasympathetic and sympathetic nervous systems - ANSWERa. the
parasympathetic nervous system
Cardiac muscle cells are all of the following EXCEPT
a. multinucleated, like skeletal muscle
b. linked by intercalated discs
c. branched
d. stimulated involuntarily - ANSWERa. multinucleated, like skeletal muscle
Which chamber of the heart has the thickest walls?
a. right atrium
b. left atrium
c. right ventricle
d. left ventricle - ANSWERd. left ventricle
The pulmonary veins travel from the __________ to the __________.
a. lungs, left atrium
b. lungs, left ventricle
c. right atrium, left atrium
d. right atrium, lungs - ANSWERa. lungs, left atrium
Acetylcholine affects the sinoatrial node by
a. promoting depolarization
,b. promoting hyperpolarization
c. promoting repolarization
d. promoting Ca2+ release - ANSWERb. promoting hyperpolarization
Resting heart rates of elite endurance athletes can be approximately
a. 90 beats/min
b. 75 beats/min
c. 60 beats/min
d. 45 beats/min - ANSWERd. 45 beats/min
The second heart sound heard through a stethoscope during auscultation indicates which event in
the heart?
a. atrioventricular valves opening
b. atrioventricular valves closing
c. pulmonary and aortic valves opening
d. pulmonary and aortic valves closing - ANSWERd. pulmonary and aortic valves closing
The valve that separates the left ventricle from the general circulation is the
a. tricuspid valve
b. aortic valve
c. pulmonary valve
d. mitral valve - ANSWERb. aortic valve
Extracellular Ca2+ influx stimulating intracellular Ca2+ release for contraction is called
a. extracellular-intracellular coupling
b. Ca2+-dependent SR stimulation
c. Ca2+-induced Ca2+ release
d. synergistic Ca2+ accumulation - ANSWERa. extracellular-intracellular coupling
Cardiac muscle fibers are most similar to which skeletal muscle fiber?
a. type I
, b. type IIa
c. type IIb
d. type IIx - ANSWERa. type I
At a heart rate of 120 beats/min,
a. norepinephrine is stimulating the heart
b. acetylcholine is stimulating the heart
c. parasympathetic tone is maximal
d. sympathetic stimulation is maximal - ANSWERa. norepinephrine is stimulating the heart
During diastole,
a. ventricular pressure increases rapidly
b. pulmonary and aortic valves are open
c. atrioventricular valves are closed
d. atria and ventricles fill with blood - ANSWERd. atria and ventricles fill with blood
The increase in heart rate at the very beginning of exercise is due to
a. increased sympathetic activity
b. increased vagal tone
c. withdrawal of vagal stimulation
d. increased parasympathetic activity - ANSWERa. increased sympathetic activity
At rest, the _____________ receive(s) about 50% of cardiac output.
a. liver and kidneys
b. skin
c. skeletal muscle
d. brain - ANSWERa. liver and kidneys
In general, the stimulation of the sympathetic nervous system causes __________ blood vessels.
a. vasodilation of
b. vasoconstriction of
A normal resting heart rate is determined by
a. the parasympathetic nervous system
b. the sympathetic nervous system
c. neither the parasympathetic nor the sympathetic nervous system
d. a combination of parasympathetic and sympathetic nervous systems - ANSWERa. the
parasympathetic nervous system
Cardiac muscle cells are all of the following EXCEPT
a. multinucleated, like skeletal muscle
b. linked by intercalated discs
c. branched
d. stimulated involuntarily - ANSWERa. multinucleated, like skeletal muscle
Which chamber of the heart has the thickest walls?
a. right atrium
b. left atrium
c. right ventricle
d. left ventricle - ANSWERd. left ventricle
The pulmonary veins travel from the __________ to the __________.
a. lungs, left atrium
b. lungs, left ventricle
c. right atrium, left atrium
d. right atrium, lungs - ANSWERa. lungs, left atrium
Acetylcholine affects the sinoatrial node by
a. promoting depolarization
,b. promoting hyperpolarization
c. promoting repolarization
d. promoting Ca2+ release - ANSWERb. promoting hyperpolarization
Resting heart rates of elite endurance athletes can be approximately
a. 90 beats/min
b. 75 beats/min
c. 60 beats/min
d. 45 beats/min - ANSWERd. 45 beats/min
The second heart sound heard through a stethoscope during auscultation indicates which event in
the heart?
a. atrioventricular valves opening
b. atrioventricular valves closing
c. pulmonary and aortic valves opening
d. pulmonary and aortic valves closing - ANSWERd. pulmonary and aortic valves closing
The valve that separates the left ventricle from the general circulation is the
a. tricuspid valve
b. aortic valve
c. pulmonary valve
d. mitral valve - ANSWERb. aortic valve
Extracellular Ca2+ influx stimulating intracellular Ca2+ release for contraction is called
a. extracellular-intracellular coupling
b. Ca2+-dependent SR stimulation
c. Ca2+-induced Ca2+ release
d. synergistic Ca2+ accumulation - ANSWERa. extracellular-intracellular coupling
Cardiac muscle fibers are most similar to which skeletal muscle fiber?
a. type I
, b. type IIa
c. type IIb
d. type IIx - ANSWERa. type I
At a heart rate of 120 beats/min,
a. norepinephrine is stimulating the heart
b. acetylcholine is stimulating the heart
c. parasympathetic tone is maximal
d. sympathetic stimulation is maximal - ANSWERa. norepinephrine is stimulating the heart
During diastole,
a. ventricular pressure increases rapidly
b. pulmonary and aortic valves are open
c. atrioventricular valves are closed
d. atria and ventricles fill with blood - ANSWERd. atria and ventricles fill with blood
The increase in heart rate at the very beginning of exercise is due to
a. increased sympathetic activity
b. increased vagal tone
c. withdrawal of vagal stimulation
d. increased parasympathetic activity - ANSWERa. increased sympathetic activity
At rest, the _____________ receive(s) about 50% of cardiac output.
a. liver and kidneys
b. skin
c. skeletal muscle
d. brain - ANSWERa. liver and kidneys
In general, the stimulation of the sympathetic nervous system causes __________ blood vessels.
a. vasodilation of
b. vasoconstriction of
