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BIO 251: EXAM 3 – QUESTIONS WITH SOLUTIONS
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BIO 251: EXAM 3 – QUESTIONS WITH SOLUTIONS
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BIO 251: EXAM 3 – QUESTIONS WITH SOLUTIONSCardiac output is determined by what two variables?
A) stroke volume and ejection fraction
B) heart rate and ejection fraction
C) end-diastolic volume and end-systolic volume
D) heart rate and stroke volume
E) preload and afterload Right Ans - D
Regulation of the heart (or any organ or tissue) by neural input, circulating
hormones, or any other factor originating from outside the organ is referred
to as ________ control.
A) intrinsic
B) neurogenic
C) extrinsic
D) voluntary
E) myogenic Right Ans - C
Which of the following structures is poorly innervated by the parasympathetic
nervous system and, therefore, an increase in parasympathetic activity has
little effect on this structure?
A) ventricles
B) conduction pathway
C) sinoatrial node
D) Purkinje fibers
E) atrioventricular node Right Ans - A
The SA node is innervated by the
A) sympathetic nervous system only.
B) somatic nervous system only.
C) parasympathetic nervous system only.
D) sympathetic and parasympathetic nervous systems.
E) sympathetic, parasympathetic, and somatic nervous systems. Right Ans -
D
Which of the following is an effect of parasympathetic activity to the heart?
A) The rate of spontaneous depolarization in SA nodal cells decreases.
B) SA nodal cells are depolarized.
C) Heart rate is increased.
, D) cAMP is activated.
E) Postganglionic neurons release acetylcholine, which binds to nicotinic
cholinergic receptors in
the SA node. Right Ans - A
Which of the following is a FALSE statement about sympathetic activity to the
SA node?
A) Norepinephrine binds to beta1 adrenergic receptors.
B) Potassium channel closing is enhanced.
C) cAMP levels in the pacemaker cells increases.
D) Funny channel opening is enhanced.
E) The rate of spontaneous depolarization is increased. Right Ans - B
Under resting conditions, heart rate is primarily under the control of what
control system?
A) the parasympathetic nervous system
B) the somatic nervous system
C) the sympathetic nervous system
D) intrinsic mechanisms
E) epinephrine Right Ans - A
An increase in heart rate can be mediated through which of the following?
A) a decrease in parasympathetic nervous activity only
B) a decrease in sympathetic activity only
C) an increase in sympathetic activity only
D) an increase in parasympathetic activity and a decrease in sympathetic
activity
E) a decrease in parasympathetic activity and an increase in sympathetic
activity Right Ans - E
Which of the following would NOT result from an increase in ventricular
contractility?
A) increased ejection fraction
B) increased stroke volume
C) decreased end-diastolic volume
D) decreased end-systolic volume
E) increased proportion of end-diastolic volume that is ejected Right Ans -
C
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