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Heart structure

100

This is the thickest layer of the heart wall and is responsible for contraction.

Myocardium 

200

The heart is located in this area of the body between the lungs.

Thorax

300

This outermost layer of the heart is also known as the visceral pericardium.

Epicardium

400

These three layers make up the heart wall.

endocardium, myocardium, and epicardium

500

This structure forms a protective sac around the heart and has a potential space between its layers.

pericardium

Heart chambers

100

The heart has this many chambers.

4

200

These two upper chambers of the heart receive blood.

atria

300

This chamber pumps oxygen-rich blood into the aorta

left ventricle

400

This wall separates the left and right sides of the heart.

Septum 

500

This chamber pumps oxygen-poor blood into the pulmonary circulation

right ventricle

Heart valves

100

This valve is located between the right atrium and right ventricl

tricuspid valve

200

This valve prevents backflow from the aorta into the left ventricle.

aortic semilunar valve

300

This valve is also called the mitral valve

bicuspid valve

400

The chordae tendineae are also called these

‘Heart strings 

500

This valve disorder can cause blood to leak back into the atrium

mitral valve regurgitation

Blood Vessels

100

These arteries supply oxygen-rich blood to the heart muscle.

coronary arteries

200

This large artery receives blood from the left ventricle.

Aorta

300

This large vein collects blood from the coronary veins and empties into the right atrium.

coronary sinus

400

These veins return oxygenated blood from the lungs to the left atrium.

pulmonary veins

500

This condition occurs when a coronary artery becomes blocked, leading to reduced blood flow.

myocardial infarction (heart attack)

Heart electrical system

100

This node is known as the heart’s pacemaker.

sinoatrial (SA) node

200

This node delays the electrical impulse before it reaches the ventricles.

atrioventricular (AV) node

300

These specialized fibers distribute impulses through the ventricles.

Purkinje fibers

400

This bundle transmits impulses between the atria and ventricles.

bundle of His (AV bundle)

500

This type of heart activity is recorded using an electrocardiogram (ECG).

electrical conduction