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The myocardium receives its blood supply from the coronary arteries.


The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic valves.


Autonomic regulation of heart rate is via two reflex centers found in the pons.


The dicrotic notch refers to the brief rise in pressure caused by the closure of the AV valves during ventricular systole.


An ECG provides direct information about valve function.


Cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle.


Proper function of the heart is dependent upon blood levels of ionic sodium.




Tissues damaged by myocardial infarction are replaced by connective tissue.


The left side of the heart pumps the same volume of blood as the right.


Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart.


The mitral valve has chordae but the tricuspid valve does not.


Trabeculae carneae are found in the ventricles and never the atria.


Normal heart sounds are caused by which of the following events?

closure of the heart valves

To auscultate the aortic valve, you would place your stethoscope in the ________.

second intercostal space to the right of the sternum


coronary arteries

When the heart is beating at a rate of 75 times per minute, the duration of one cardiac cycle is ________ second(s).


Which of the following factors does not influence heart rate?

Skin color


decreased delivery of oxygen

Cardiac muscle cells are like skeletal muscle cells in that they have ________.

I and A bands

Cardiac output is about ________ L/min.


The pericardial cavity ________.

contains a lubricating fluid called serous fluid


tetanic contractions might occur, which would stop the heart's

Norepinephrine acts on the heart by ________.

causing threshold to be reached more quickly

Cardiac reserve ________.

can be improved by regular exercise


the heart rate would increase by about 25 beats per minute

The stroke volume for a normal resting heart is ________ ml/beat


Which vessel of the heart receives blood during right ventricular systole?

pulmonary trunk

Blood ejected from the ventricles enters which of these vessels during ventricular systole?

both the aorta and pulmonary trunk


AV valve

The tricuspid valve is closed ________.

while the ventricle is contracting


noticing the thickness of the ventricle walls

Select the correct statement about the heart valves.

The AV valves are supported by chordae tendineae so that they

Select the correct statement about the function of myocardial cells.

The all-or-none law as applied to cardiac muscle means that the

Select the correct statement about the structure of the heart wall.

The myocardium is the layer of the heart that actually contracts.

Hemorrhage with a large loss of blood causes ________.

a lowering of blood pressure due to change in cardiac output

Compared to skeletal muscle, cardiac muscle ________.

has gap junctions that allow it to act as a functional syncytium

Cardiac muscle ________.

has sarcomeres with A bands and I bands

The deflection waves in an ECG tracing include ________.

the T wave, which indicates ventricular repolarization

During the period of ventricular filling ________.

blood flows passively through the atria and the open AV valves

The effect of endurance-type athletic training may be to lower the resting heart rate. This phenomenon ________.

is caused by hypertrophy of the heart muscle


isovolumetric relaxation

If a significant amount of connective tissue were to develop connecting the visceral and parietal pericardial layers together, which of the following would be a likely consequence?

interference with normal mechanical cardiac activity


threshold is reached more quickly and heart rate would increase

Select the correct statement about cardiac output.

A slow heart rate increases end diastolic volume, stroke volume,and force end of contraction

During contraction of heart muscle cells ________.

some calcium enters the cell from the extracellular space and


pump blood with greater pressure

Isovolumetric contraction ________.

refers to the short period during ventricular systole when the ventricles are completly closed chambers

Negative chronotropic factors are factors that ________.

decrease heart rate

Damage to the ________ is referred to as heart block

AV node

The P wave of a normal electrocardiogram indicates ________.

atrial depolarization

Blood within the pulmonary veins returns to the ________.

left atrium

Small muscle masses attached to the chordae tendineae are the ________.

papillary muscles


angina pectoris

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