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papillary muscles

Structure from which chordae tendinae originate

tricuspid valve

Prevents blood movement from right ventricle to right atrium

pericardial sac

Membranes around the heart

mitral valve

Prevents blood movement from the left ventricle to left atrium

pulmonary trunk

Gives rise to left and right pulmonary arteries

coronary artery

Drains blood from myocardium into the right atrium


Inner lining of heart chamber


Layer largely composed of cardiac muscle tissue

pericardial cavity

Space containing serous fluid to reduce friction during heartbeats

cardiac vein

Drains blood from myocardial capillaries

coronary artery

Supplies blood to heart muscle


Distributes blood to body organs except the lungs

P Wave

Depolarization of atrial fibers

P-Q (P-R) Interval

Time for cardiac impulses from SA node through AV node

QRS Complex

Depolarization of ventricular fibers

S-T Segment

Time for ventricles to contract

Q-T interval

Time from ventricular depolarization to end of ventricular repolarization

T wave

Repolarization of ventricular fibers

About 70%

About what percentage of blood passes into the ventricles before the atrial walls contract?


What is the period during which a heart chamber is contracting called?


What is the period during which a heart chamber is relaxing called?

During ventricular contraction

When are the AV valves (tricuspid and mitral valves) closed?

During ventricular relaxation

When are the AV valves open?

When the pressure in the ventricles exceeds the pressure in the pulmonary trunk and aorta.

When do the pulmonary and arotic valves open?

Vibrations in heart tissues created by changes in blood flow.

What causes heart sounds?

When the AV valves are closing.

When does the first sound of a cardiac cycle occur?

When the semilunar valves are closing.

When does the 2nd sound of a cardiac cycle occur?

A Murmer

What is the sound called when blood leaks back through an incompletely closed valve?

Specialized Cardiac Muscle Tissue

What are the fibers of the cardiac conduction system called?

The SA node (Sinoatrial node)

Under normal circumstances, what serves are the pacemaker of the heart?

in the inferior portion of the interatrial septum

Where is the AV (atrio ventricular) node located?

The AV bundle

What do the large fibers on the distal side of the AV node makeup?

Purkinje fibers

What are the fibers that carry cardiac impulses from the interventricular septum into the myocardium called?

An electrocardiogram

What is a recording of electrical changes occuring in the myocardium during the cardic cycle called?


Between cardiac cycles, cardiac muscle fibers remain __?__ with no detectable electrical changes.

The P wave

What wave corresponds to depolarization of the muscle fibers of the atria?


The QRS complex corresponds to de-polarization of the muscle fibers in the__?__.


The T wave corresponds to repolarization of the muscle fibers in the ___?___.

Atrial repolarization occurs at the same time as ventricular depolarization. The QRS complex hides atrial repolarization.

Why is atrial repolarization not observed in an ECG?


What is a rapid heart beat called?


What is a slow heart beat called?


What distributes blood to body organs (systemic circuit) except lungs?

Cardian Vein

What drains blood from myocardial capillaries?

Coronary Artery

What supplies blood to heart muscle?

Coronary Sinus

What drains blood from myocardium into the right atrium?

The Endocardium

What is the inner lining of the heart chamber called?

The mitral valve A.K.A. bicuspid valves

What prevents blood movement from the right ventricle to the right atrium?


What is the layer largely composed of cardiac muscle tissue?

The papillary Muscle

What is the structure from which the Cordae Tendineae originate?

Pericardial cavity

What is the space called that contains serous fluid that reduces friction during heartbeats?

Pericardial sac

What are the membranes around the heart called?

The pulmonary trunk

What structure gives rise to the left and right pulmonary arteries?

Tricuspid valve a.k.a. right atrioventricular valves

What prevents blood movement from right ventricle to right atrium?

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