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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
Haemoglobin is present in ______ cells.
Describe, in brief, the circulatory system in human beings.
Name the following:
The artery which carries deoxygenated blood.
What is meant by the term 'double circulation' of blood in mammals? What is diastole?
Put a tick mark (✓) against the correct alternative in the following statement.
The blood tastes saltish due to the dissolved.
Fill in the blanks with suitable words given below:
The oxygen-rich blood is pumped into different parts of the body through ______.
The stomach is like a ______.
Describe how the exchange of oxygen and carbon dioxide gases takes place in the lungs.
All the waste products of the body are excreted through the circulatory system.
Thin tube-like structures which are the component of circulatory system are called blood vessels.
