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4.2 Med Chem of Nitrodilators ECG & Exercise Stress Study Chapter 16 Vascular Lab
55 terms 40 terms 29 terms 11 tel
roseesarahh Preview &3 hzfnq78q2w Preview =) smicjohnson Preview
Terms in this set (56)
Cardiac 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
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
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
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
isomatic nervous systems.
, 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
lacetylcholine, which binds to nicotinic
cholinergic receptors in
the SA node.
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.
Under resting conditions, heart rate is
primarily under the control of what control
isystem?
A) the parasympathetic nervous system
B) the somatic nervous system
C) the sympathetic nervous system
D) intrinsic mechanisms
E) epinephrine
An increase in heart rate can be mediated
through which of the following?
A) a decrease in parasympathetic nervous
ctivity only
B) a decrease in sympathetic activity only
C) an increase in sympathetic activity only
D) an increase in parasympathetic activity
nd a decrease in sympathetic activity
E) a decrease in parasympathetic activity
nd an increase in sympathetic activity
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
4.2 Med Chem of Nitrodilators ECG & Exercise Stress Study Chapter 16 Vascular Lab
55 terms 40 terms 29 terms 11 tel
roseesarahh Preview &3 hzfnq78q2w Preview =) smicjohnson Preview
Terms in this set (56)
Cardiac 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
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
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
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
isomatic nervous systems.
, 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
lacetylcholine, which binds to nicotinic
cholinergic receptors in
the SA node.
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.
Under resting conditions, heart rate is
primarily under the control of what control
isystem?
A) the parasympathetic nervous system
B) the somatic nervous system
C) the sympathetic nervous system
D) intrinsic mechanisms
E) epinephrine
An increase in heart rate can be mediated
through which of the following?
A) a decrease in parasympathetic nervous
ctivity only
B) a decrease in sympathetic activity only
C) an increase in sympathetic activity only
D) an increase in parasympathetic activity
nd a decrease in sympathetic activity
E) a decrease in parasympathetic activity
nd an increase in sympathetic activity
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
