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heart study guide

T OR F: the mitral valve has chordae but the tricuspid valve does not


T OR F: the myocardium receives its blood supply from the coronary arteries


T OR F: trabeculae carneae are found in the ventricles and never the atria


T OR F: congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues


T OR F: the "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's semilunar valve


T OR F: as pressure in the aorta rises due to athersclerosis, more ventricular pressure is required to open the aortic semilunar valve


T OR F: the atrira receive blood returning to the heart


T OR F: an ECG provides direct information about valve function


T OR F: the left side of the heart pumps the same volume of blood as the right


T OR F: cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle


T OR F: a heart rate less than 60 bpm is called tachycardia


T OR F: the aortic semilunar valve opens when pressure in the aorta is higher than the ventricular pressure


the lining of the heart


heart muscle


serous layer covering the heart muscle


the outermost layer of the serous pericardium

parietal pericardium

the pacemaker of the heart

SA node

found in the IV septum

AV bundle

network found in the ventricular myocardium

Purkinje fibers

the point in the conduction system of the heart where the impulse is temporarily delayed

AV node

prevents backflow into the left ventricle

aortic semilunar valve

prevents backflow into the right atrium

tricuspid valve

prevents backflow into the left atrium

mitral valve

prevents backflow into the right ventricle

pulmonary semilunar valve

av valve with three flaps

tricuspid valve

av valve with two flaps

mitral (bicuspid) valve

normal heart sounds are caused by which of the following events

closure of the heart valves

hemorrhage with a large loss of blood causes:

a lowering of blood pressure due to change in cardiac output

damage to the _____ is referred to as heart block

AV node

to auscultate the aortic semilunar valve, you would place your stethoscope

in the second intercostal space to the right of the sternum

blood within the pulmonary veins returns to the:

left atrium

blood is carried to capillaries in the myocardium by the way of:

coronary arteries

which of the following factors does not influence heart rate

skin color

small muscle masses attached to the chordae tendineae are the:

papillary muscles

if cardiac muscle is deprived of its normal blood supply, damage would primarily result from:

decreased delivery of oxygen

cardiac muscle cells are like skeletal muscle cells in that they:


the pericardial cavity:

contains a lubricating fluid called serous fluid

foramen ovale:

connects the two atria in the fetal heart

the SV for a normal resting heart is ________ ml/beat


which vessel of the heart receives blood during right ventriuclar systole

pulmonary arteries and aorta, both A and B are correct

stenosis of the mitral valve may initially cause a pressure increase in the

pulmonary circulation

which of the following is not part of the conduction system of the heart?

AV valve

which of the following is not an age-related change affecting the heart

thinning of the valve flaps

during the period of ventricular filling:

blood flows passively through the atria and the open AV valves

the tricuspid valve is closed:

when the ventricle is in systole

correct statement about the function of myocardial cells

the all-or-none law as applied to cardiac muscle means that the entire heart contracts as a unit it it does not contract at all

correct statement about the heart valves

the AV valves are supported by the chordae tendineae so that they do not blow back up into the atria during ventricular contraction

correct statement about the structure of the heart wall

the myocardium is the layer of the heart that actually contracts

the effect of endurance-type athletic training may be to lower the heart rate. this phenomenon:

is caused by hypertrophy of the heart muscle

during contraction of the heart muscle cells:

some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores

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