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प्रश्न
Given below is a simple diagram of the circulation of blood in a mammal showing the main blood vessels, the heart, lungs, and body tissues. The blood vessel labeled 6 contains deoxygenated blood and 2 the valve leading to it has three semi-lunar pockets.
(i) Name the blood vessels of organs marked by numbers 1 to 8.
(ii) What do you mean by the term ‘double circulation’ of blood in mammals?
(iii) What is diastole?
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उत्तर
(i)
1. Veins from tissues.
2. Superior vena cava
3. Aorta
4. Right ventricle
5. Left ventricle
6. Pulmonary Artery
7. Pulmonary vein
8. Lungs.
(ii) The heart is said to have double circulation because the blood passes through the heart twice.
(a) It first leaves t.rough the right ventricle, goes to the lungs and then returns to the left auricle of the heart (pulmonary circulation).
(b) It leaves through the left ventricle, circulates through the body, and again returns to the right auricle of heart (systemic circulation).
(iii) Diastole is the phase of relaxation of the heart muscles during which the heart chambers fill with blood and the supply of blood to the cardiac muscle is improved.
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संबंधित प्रश्न
Differentiate between the following pair of terms:
RBC and WBC.
Give any three differences between an artery and a vein.
Fill in the blank with suitable word given below:
The colour of a red blood cell is due to _______________.
Answer very briefly, Red Blood cells have no nucleus, then why do we call them cells?
What is blood pressure? When does it rise?
Study the following diagram carefully:
(a) With which figure in the chapter can you roughly compare this diagram?
(b) Write any two things shown in it as extra from those in the figure named above.
Name the Following
The blood vessel leaving the left ventricle of the mammalian heart
Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure.
Differentiate between an artery and a vein with reference to lumen and thickness of wall.
______ carry blood to an organ and break up into ______ ending in capillaries.
