CBSE Class 10 Answered
Describe the structure of human heart with diagram.
Asked by haritsourabhharit | 15 Oct, 2010, 12:50: PM
Expert Answer
Dear student,
The human heart is a pear-shaped structure about the size of a fist. It is responsible for supplying the body with oxygenated blood.
The heart is made of a special kind of muscle called myocardium, and is enclosed in a double-layered, membranous sac called a pericardium.
The heart lies in the chest cavity between the lungs. It is composed of four chambers, many large arteries and many veins.
The four chambers are called atrium and ventricles. The two upper cambers are the right and left atria, and two lower chambers, are the right and left ventricles. The right atrium receives blood from the upper and lower body through the superior vena cava and the inferior vena cava, respectively, and from the heart muscle itself through the coronary sinus. The right atrium is the larger of the two atria, having very thin walls. The right atrium opens into the right ventricle through the right atrioventicular valve(tricuspid), which only allows the blood to flow from the atria into the ventricle, but not in the reverse direction.
The right ventricle pumps the blood to the lungs to be reoxygenated.
The left atrium receives blood from the lungs via the four pulmonary veins. It is smaller than the right atrium, but has thicker walls. The valve between the left atrium and the left ventricle, the left atrioventicular valve(bicuspid), is smaller than the tricuspid. It opens into the left ventricle and again is a one way valve.
The left ventricle pumps the blood throughout the body through the aorta, which is the largest artery in the body. The walls of the left ventricle are the thickest among all the chambers.
Hope this answers your question.
Regards,
Team Topperlearning.
Answered by | 16 Oct, 2010, 07:24: AM
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