THE HEART AND BLOOD VESSELS
CONTENT
- Meaning of the Heart
- The Heartbeat
- The Blood Vessels
- Differences between the Artery and the Vein
- Circulation of Blood
Meaning of the Heart
The heart is the most powerful organ in the circulatory system. It helps to pump the blood round the body. Each pumping action is called a heartbeat.
The Heartbeat
The heart is made up of muscles called the cardiac muscles which contract and relax continuously, making the heart to beat ceaselessly. It is covered by a thick membrane called, pericardium which keeps the heart in good position in the thoracic cavity.
The heart consists of four chambers upper auricle (right and left auricle) the lower ventricles (right ventricle and left ventricles). A central wall called the septum divides the heart into right and left halves.
Between the left auricle and the left ventricle is an aperture guarded by a biscupid/mitral valve and another valve, the triscupid valve is found between the right auricle and the right ventricles.
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