The Human Heart

Vocabulary flashcards covering key terms related to the structure and function of the human heart.

Mediastinum

The hollow space between the lungs where the heart is located.

Pericardium

The double-layered membrane surrounding the heart, consisting of two inelastic membranes.

Coronary Arteries

Arteries visible on the exterior of the heart that supply oxygen and nutrients to the heart muscle.

Heart Attack

Also known as myocardial infarction, it occurs when blockage of coronary arteries leads to the death of heart muscle.

Atria

The two upper chambers of the heart that collect blood from the veins.

Ventricles

The two lower chambers of the heart that contract to pump blood out to the body.

Myocardium

The layer of the heart wall composed of cardiac muscle tissue.

Septum

The wall that divides the heart into right and left sides.

Endocardium

The smooth membrane lining the heart, composed of endothelial tissue.

Chordae Tendineae

Tendinous cords that extend from papillary muscles to atrioventricular valves, helping to keep the valves closed during contraction.

Atrioventricular Valves

Valves located between the atria and the ventricles that ensure one-way blood flow.

Semi-lunar Valves

Valves at the base of the arteries leaving the heart, including the pulmonary artery and aorta.

First Heart Sound

The sound produced when the atrioventricular valves close.

Second Heart Sound

The sound produced when the semilunar valves close.