mastering a&p: 17
Calculate the end-systolic volume (ESV) if the end-diastolic volume (EDV) in a resting heart is 110 ml and stroke volume (SV) is 70 ml.
40 ml
The amount of blood remaining in each ventricle at the end of the ventricular ejection phase is normally about
50 ml
How much blood is pumped from each ventricle during the ventricular ejection phase
70 ml
There are two phases of the cardiac cycle in which all four heart valves are open: isovolumetric contraction phase and the isovolumetric relaxation phase
False
A damaged atrioventricular (AV) bundle or atrioventricular (AV) node will primarily affect the length of the
P-R interval
Which of the following can be used to measure heart rate
R-R interval
The cardiac conduction system is normally regulated by a population of pacemaker cells known as the sinoatrial (SA) node
True
The left side of the heart is often called the systemic pump due to blood flow to the body
True
Which of the following decreases heart rate
acetylcholine
The P wave on an electrocardiogram (ECG) represents the depolarization of cells in the
atria
Which hormone decreases cardiac output by decreasing blood volume and preload
atrial natriuretic peptide
Autorhythmicity is the responsibility of
cardiac pacemaker cells
Inotropic agents affect
contractility
The right side of the heart receives
deoxygenated blood from the systemic circuit
What largely determines preload
end-diastolic volume
The visceral pericardium is the same as the
epicardium
High pressured blood in the ventricles
forces the semilunar valves open
The pulmonary circuit involves blood flow from the heart to and from the
lungs
During what part of the action potential will calcium ions enter the contractile cell
plateau phase
The degree of stretch experienced by the sarcomeres in the ventricle cells before they contract is called
preload
What is the function of the valves in the heart
prevent backflow of blood through the heart
Which vessel is guarded by a semilunar valve at its base
pulmonary trunk
Which of the following vessels carries oxygenated blood
pulmonary vein
What vessel(s) deliver oxygenated blood to the left atrium
pulmonary veins
What valve prevents the backflow of blood from the right ventricle into the right atrium
right atrioventricular valve (tricuspid valve)
The right and left atria depolarize and contract following the arrival of the action potential from the
sinoatrial (SA) node
What normally serves as the pacemaker of the entire heart
sinoatrial (SA) node
What two values are needed in order to calculate cardiac output (CO) for a ventricle
stroke volume (SV) and heart rate (HR)
Blood in the right atrium should travel next past the
tricuspid valve and into the right ventricle
Both the left and right atria receive blood from
veins
