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PERICARDIUM

Sling-like structure that supports the heart.

The epicardium is part of this structure.

CORONARY ARTERIES

Delivers oxygenated blood to the myocardium.

Also called the "window maker"

ENDOCARDIUM

Smooth, shiny, innermost lining of the heart.

RIGHT ATRIUM

Chamber that receives unoxygenated blood from the venae cavae.

RIGHT VENTRICLE

Chamber that pumps unoxygenated blood to the lungs through the pulmonary artery.

GREAT VESSELS

Term that includes the venae cavae, pulmonary artery, pulmonary veins and aorta.

VENTRICLES

Primary pumping chambers of the heart.

LEFT ATRIUM

Chamber that receives oxygenated blood from lungs through four pulmonary veins.

EPICARDIUM

Outernost layer of the heart.

LEFT VENTRICLE

Chamber that pumps oxygenated blood into the systemic circulation.

The myocardium is the thickest in this chamber.

Hardest working chamber.

MYOCARDIAL INFARCTION

Death of the heart muscle caused by occlussion of a coronary artery.

ATRIA

Receiving chambers of the heart.

CORONARY VEINS

Drains unoxygenated blood from the myocardium.

ANGINA PECTORIS

Chest pain usually caused by impaired flow of blood through the coronary arteries.

PRECORDIUM

Area on the anterior chest that overlies the heart and great vessels.

MYOCARDIUM

Layer of the heart that contains the contractile proteins, actin and mysoin.

BASE

Upper flat portion of the heart that is located at the level of the second rib.

PERICARDIAL CAVITY

Collection of fluid or blood in this space causes an external compression of the heart called (cardiac tamponade)

CARDIOLOGY

The study of the heart.

PULMONIC VALVE

Semilunar valve through which blood leaves the right ventricle.

Valve that prevents the backflow of blood from the pulmonary artery.

Exit valve that sees only unoxygenated blood.

TRICUSPID VALVE

Atrioventricular valve on the right side of the heart.

Entrance valve that sees only unoxygenated blood.

BICUSPID VALVE

Called the Mitral valve.

Entrance valve that sees only oxygenated blood.

Valve that prevents the backflow of blood from the left ventricle.

Atrioventricular valve between the left atrium and the left ventricle.

INCOMPETENT VALVE

Leaky valve that allows the backflow of blood.

S1

The first heart sound (lubb)

Heart sound created by the closure of the AV valves to the ventricular walls.

Heart sound created by the closure of the semilunar valves at the beginning of ventricular relaxation.

AORTIC VALVE

Exit valve that only sees oxygenated blood.

Valve that prevents the backflow of blood into the left ventricle.

Semilunar valve through which blood leaves the left ventricle.

CHORDAE TENDINEAE

Tough bands that attach the AV valves to the ventricular walls.

VALVULAR STENOSIS

Refers to the narrowing of a valve.

GALLOP RHYTHM

Extra heart sounds (S3,S4) that sound like a racing horse.

MUR MUR

Abnormal heart sounds caused by valvular disease.

VENTRICULAR FIBRILLATION

Life-threatening dysrhythmia that causes the ventricular myocardium to quiver in an uncoordinated and ineffective way.

SA NODE

Pacemaker

Place where the electrical signal normally arises.

BRADYCARDIA

Heart rate below 60 beats per minute

Bundle of HIS

Specialized conduction tissue in the interventricular septum.

Divided into the right and left branches.

AV NODE

The electrical signal spreads from the conduction tissue in the atria to this structure.

ECTOPIC FOCUS

Area outside of the SA node that gives rise to an electrical signal

PURKINJE FIBERS

These fast-conducting fibers spread the electrical signal throughout the ventricular wall.

ELECTROCARDIOGRAM

Record of the electrical activity of the heart (a heart chart).

NORMAL SINUS RHYTHM

Electrical activity appears normal and the signal arises within the SA node.

TACHYCARDIA

Heart rate greater then 100 beats per minute.

P- WAVE

ECG deflection that indicates atrial depolarization.

Electrical event that stimulates atrial contraction

QRS COMPLEX

ECG deflection that indicates ventricular depolarization.

Electrical event that stimulates ventricular myocardial contraction.

T- WAVE

ECG deflection that indicates ventricular repolarization.

P-R INTERVAL

Lengthening of this time indicates heart block.

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