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प्रश्न
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उत्तर
Circulatory system: It is a system of organs that takes part in the flow of materials in the body of an organism inside an extracellular fluid.
Circulatory system in humans:
(a) The right atrium receives deoxygenated blood from all the parts of the body through large veins called vena cava.
(b) When the right atrium is full of blood, it contracts and the blood is forced into right ventricle.
(c) When the right ventricle is full of blood, it contracts and the blood is pumped into the pulmonary trunk.
(d) From right ventricle, the pulmonary artery carries the blood to the lungs for oxygenation.
(e) The oxygenated blood returns to the heart via pulmonary veins that empty into the left auricle.
(f) When the left auricle contracts, the blood passes into the left ventricle by the opening of bicuspid valve.
(g) On contraction of the left ventricle, the blood is pumped into the artery called aorta.
(h) The aorta branches into vessels which transports blood to the heart and all the body parts.
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संबंधित प्रश्न
Give technical terms for The protective covering of the heart
With which human organ system (or human systems) is the vena cava associated?
The cells in our blood which destroy disease-causing germs are ______.
The chief function of lymph nodes is to
Given below is a certain structure, write its chief functional activity.
Bone marrow - ______.
Give reason for the following:
The blood groups of both the donor and recipient must be known before transfusing blood.
Explain with reasons.
Human blood is red coloured.
True or false:
The four blood groups in human beings are A, B, AB and AO
Define the Veins.
Write a short note on the human heart.
