EVERYTHING YOU EVER WANTED TO KNOW ABOUT HEARTS

Anatomy of the Heart • The heart is a hollow muscle. • It is located on the left side of your chest, about the size of your clenched fist • It is divided into four sections called chambers • Two chambers are on the left and right side. • Each side has an upper and lower chamber.

Chambers of the Heart

Chambers of the Heart • The right upper receives blood from the body. • The right lower pumps blood to the lungs. • The left upper receives blood from the lungs. • The left lower pumps blood to the rest of the body.

Blood flow in the heart

Flow around the body

Valves • Valves are flaps of tissue that stop blood flowing backwards • There are two kinds of valves in the heart. • The first kind is the massive valves between the atria and the ventricles, the atrio-ventricular valves, (AV valves) that prevent blood in the ventricles from flowing back into the atria. • The flaps of these valves are attached to the walls of the ventricles by tendons – chordae tendinae

Valves • The second kind of valve is pocket shaped flaps of tissue called the semilunar (half moon) valves • They are called the pulmonary and aortic valves and found at the entrance of the pulmonary artery and aorta respectively

Whats the Lub Dub?

What’s the Lub Dub? • The first heart sound (lub) is caused by the acceleration and deceleration of blood and a vibration of the heart at the time of the closure of the tricuspid and mitral valves. • The second heart sound (dub) is caused by the same acceleration and deceleration of blood and vibrations at the time of closure of the pulmonic and aortic valves.

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