Cardiac Test Questions with Verified Answers Rated A
What are the individual ion contributions to the
resting membrane potential (RMP) of the SA node Bicuspid - -Between left atrium and left
nodal cells? - -(X) Greater concentration of ventricle
Na+ outside the cell
( ) No Na+/K+ pump
(X) Greater concentration of K+ inside the cell Aortic semilunar Valve - -Between left ventricle
(X) Calcium (Ca2+) gradient with more calcium and ascending aorta
outside the cell
Serous fluid secreted by both the parietal and visceral
Check all that occur during ventricular systole. - layers of the pericardium, and released into the
-( ) The AV valves open to allow blood to enter pericardial cavity, lubricates the membranes and
the ventricles from the atria. facilitates the almost frictionless movement of the
( ) The semilunar valves remain closed throughout heart when it beats. - -True
systole to prevent backflow of blood into the
ventricles.
(X) The semilunar valves open to allow blood to flow The difference between the maximum and resting
into the large arteries. cardiac output is called - -Cardiac reserve
(X) The AV valves close to prevent backflow of blood
into the atria.
Cardiac muscle tissue contains fewer mitochondria
than are found in skeletal muscle tissue. - -
(T/F) The resting membrane potential of cardiac
False
muscle cells depends on a low permeability of the
plasma membrane to sodium and potassium and a
higher permeability to calcium - -False Thin serous membrane of the outer surface of the
heart - -Epicardium
(T/F) Action potentials in cardiac muscle last longer
than those in skeletal muscle - -True
Thick middle layer of the heart - -Myocardium
(T/F) In skeletal muscle there is a plateau phase, a
period of slow repolarization, that is not found in Covers surfaces of the heart valves - -
Endocardium
cardiac muscle. - -False
Cell-to-cell junctions, called intercalated discs, Composed of cardiac muscle cells - -
contain distinct structural features called gap Myocardium
junctions and - -Desmosomes
The inner surface of the heart - -Endocardium
Tricuspid valve - -Between right atrium and
right ventricle
Also known as the visceral layer of serosal
pericardium - -Epicardium
Pulmonary semilunar valve - -Between right
ventricle and pulmonary trunk
Given that cardiac output equals ____________,
there are only two ways to change it: change the
1/3
What are the individual ion contributions to the
resting membrane potential (RMP) of the SA node Bicuspid - -Between left atrium and left
nodal cells? - -(X) Greater concentration of ventricle
Na+ outside the cell
( ) No Na+/K+ pump
(X) Greater concentration of K+ inside the cell Aortic semilunar Valve - -Between left ventricle
(X) Calcium (Ca2+) gradient with more calcium and ascending aorta
outside the cell
Serous fluid secreted by both the parietal and visceral
Check all that occur during ventricular systole. - layers of the pericardium, and released into the
-( ) The AV valves open to allow blood to enter pericardial cavity, lubricates the membranes and
the ventricles from the atria. facilitates the almost frictionless movement of the
( ) The semilunar valves remain closed throughout heart when it beats. - -True
systole to prevent backflow of blood into the
ventricles.
(X) The semilunar valves open to allow blood to flow The difference between the maximum and resting
into the large arteries. cardiac output is called - -Cardiac reserve
(X) The AV valves close to prevent backflow of blood
into the atria.
Cardiac muscle tissue contains fewer mitochondria
than are found in skeletal muscle tissue. - -
(T/F) The resting membrane potential of cardiac
False
muscle cells depends on a low permeability of the
plasma membrane to sodium and potassium and a
higher permeability to calcium - -False Thin serous membrane of the outer surface of the
heart - -Epicardium
(T/F) Action potentials in cardiac muscle last longer
than those in skeletal muscle - -True
Thick middle layer of the heart - -Myocardium
(T/F) In skeletal muscle there is a plateau phase, a
period of slow repolarization, that is not found in Covers surfaces of the heart valves - -
Endocardium
cardiac muscle. - -False
Cell-to-cell junctions, called intercalated discs, Composed of cardiac muscle cells - -
contain distinct structural features called gap Myocardium
junctions and - -Desmosomes
The inner surface of the heart - -Endocardium
Tricuspid valve - -Between right atrium and
right ventricle
Also known as the visceral layer of serosal
pericardium - -Epicardium
Pulmonary semilunar valve - -Between right
ventricle and pulmonary trunk
Given that cardiac output equals ____________,
there are only two ways to change it: change the
1/3
