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PSL 310 Cardiac Physiology Study Questions
Terms in this set (72)
The left side of the heart pumps blood to the lungs, the right side of the heart pumps blood with the rest of the booty.
Blood in the left atrium enters the left ventricle through the ___ valve
The long refractory period of cardiac muscle _____ tetanic contractions (tetanus) in the heart.
The plateau of the cardiac AP is caused by an increase in the permeability of which of the following.
The heart's conduction system is specialized nerve cells.
Which of the following is the sequence of excitation in a normal heart?
SA node, atrial myocardium, AV node, bundle of His, Purkinje fibers, ventricular myocardium
If the SA node is damaged and the AV node takes over as pacemaker of the heart, the HR will most likely.
The atrial syncytium is separated from the ventricular syncytium by the heart's fibrous skeleton except at the ___ (also called the "link to the ventricles".
Sympathetic impulses decrease the slope of the pacemaker potential.
In complete heart block, there is no correlation between the_____.
P waves and QRS complexes
Which of the following is an uncoordinated contraction in which small areas of the myocardium contract and relax independently (and the myocardial cells fail to contract together)?
Which of the following causes atrioventricular (AV) valves to close?
ventricular pressure > arterial pressure
Stroke volume is
The cardiac cycle for the right side of the heart is different than the cardiac cycle for the left side of the heart because ______.
the right side of the heart generated lower pressures
Immediately before the atria contract during ventricular diastole, the ventricles are _____.
A murmur can be caused by ______.
blood flowing rapidly through a narrowed valve and blood flowing backward through a leaky value
The maximum arterial pressure during the cardiac cycle is called the ______.
Increased EDV ___ SV by an _____ mechanism.
An important function of Starling's Law of the Heart is to keep the output of the two ventricles.
Increased sympathetic stimulation of the heart ___ HR and ____ contractility.
Contractility is an increase in force of contraction ____ a change in EDV.
not due to
Which of the following is caused by depolarization of the atria?
The SA node is the pacemaker of a normal heart because it ______.
depolarized to threshold at the fastest rate
Parasympathetic impulses __ the slope of the SA node pacemaker potential and ___ HR.
After passing through the atrial myocardium, the cardiac impulses reach the ___ in which the impulse is delayed 0.1 s.
If all Ca++ channels on the cell membrane of cardiac muscle cells were blocked contraction would ____.
Which of the following causes the AV valves to open?
atrial pressure > ventricular pressure
Concerning the cardiac cycle, which of the following is true?
the first heart sound is caused by closure of the AV valves
Over time (one day), the CO for the right side of the heart is normally ____ the CO for the left side of the heart.
______ flow of blood causes murmurs.
Starling's Law of the Heart states that _____ EDV ____ SV.
HR x SV
Increase sympathetic nerve activity (impulses) to the heart will _______.
Concerning the heart, which of the following is false?
the left side of the heart pumps blood to the lungs
Which of the following is the thick middle layer of the heart which is made of muscle?
If all cell membrane calcium channels in the cardiac muscle cells were blocked with a drug so that no calcium could enter the cell, the AP in those calcium channel blocked cells would ______.
be missing the plateau
The pacemaker of the heart is the ____.
Which below best describes the ECG/EKG of a person with partial heart block?
some P waves are not followed by QRS complexes
The heart, once removed from the body, cannot beat on its own (without neural stimulation).
The aortic semilunar valve opens _____.
when left ventricular pressure > aortic pressure
Concerning the cardiac cycle, which is true?
the second heart sound is causes by closure of semilunar valves
Because arteries are ____ they _____ maintain a BP to drive blood through the tissues when the ventricles are relaxing.
CO is the volume of blood pumped ______.
by either ventricle per minute
Which increases the contractility of the ventricle?
increased sympathetic impulses
Temperature can affect the heart rate.
According to Starling's Law of the Heart _____.
increased venous return will cause an increase in SV
Which is a function of the serous fluid found between the visceral and parietal layers of the pericardium?
act as a lubricant that reduces friction when the heart beats
The right side of the heart pumps blood through the ____ circulation.
The ____ separates the two function syncytia in the heart. The ____ links the two functional syncytia in the heart (link to ventricles).
hearts fibrous skeleton, AV
Which is the autorhythmic tissue that depolarizes to threshold at the fastest rate in a normal heart?
Concerning the cardiac AP of a myocardial cell in the ventricle, which of the following is true?
during the cardiac AP, Ca2+ permeability is increased compared to just before it
In cardiac muscle, Ca++ ions that enter the cell from the ECF cause Ca++ release from the sarcoplasmic reticulum (SR).
Which of the following is a correct match?
T wave- repolarization of the ventricles
Which of the following was described in lecture as cardiac chaos?
After the SA node depolarizes to threshold, which would occur last?
opening of the AV valves
Most of the filling of the ventricle occurs ____ atrial contraction
SV is _____.
the total volume of blood ejected from the ventricle during one contraction of the ventricle
You should expect all of the following to cause a murmur except _____.
laminar flow of blood
When venous return increases, EDV ____ and SV _____ due to ___.
increases, increases, Starling's Law
The length of the cardiac muscle fibers affects SV which describes ____ control of SV.
Heart muscle receives most of its oxygen and nutrients by diffusion directly from the blood within its chambers during diastole.
Between the visceral and parietal layers of the pericardium there is _____.
The left side of the heart pumps blood through the _____.
Which of the following is a correct match?
heart valves allow for one way flow of blood
Which of the following separates the two functional syncytia in the heart?
The ___ is the pacemaker of the normal heart because ____.
SA node, it the auto rhythmic tissue in the heart that depolarized to threshold fastest rate
The duration of the refractory period in cardiac muscle allows summation and tetanic contractions, which increases the force of contraction in the heart.
During the plateau phase of the cardiac action potential, the permeability of the membrane to ___ is increased which causes the plateau.
Which of the following is due to depolarization of the ventricles?
During one complete cardiac cycle, which of the following events would occur last?
closure of semilunar valves
Most of the filling of the ventricles occurs during atrial contraction.
Heart muscle ____ an AP to cause contraction.
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