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प्रश्न
Write a short note on the human heart.
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उत्तर
The heart is a pump that circulates blood to all parts of the body. It is about the size of a human fist and located to the left in chest cavity. It has four chambers – two upper chambers called auricles or atria and two lower chambers called ventricles. The auricles receive blood from different body parts and ventricles pump the blood out of the heart. The valves between auricle and ventricle on each side allow blood to flow in one direction only. Heart acts as a double pump. The right side of the heart carries deoxygenated blood to the lungs to be oxygenated. The left side of the heart pump oxygenated blood to the body.
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संबंधित प्रश्न
Name the following:
The blood vessels which start from capillaries and end in capillaries.
Name the following:
The phase of the cardiac cycle in which the auricles contract.
Note the relationship between the first two words and suggest a suitable word/words for the fourth place:
Coronary artery : Heart :: Hepatic artery : ______
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Explain the Term
Hepatic Portal System
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______ prevent blood clotting.
Which of the following is the main site of erythropoiesis in adults?
Circulation is carried out by ______ in higher animals.
Assertion (A): RBCs help in the transport of respiratory gases.
Reason (R): The cytoplasm of RBCs contains the respiratory pigment Haemoglobin.
