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प्रश्न
Give reason, why a matured mammalian erythrocyte lacks nucleus and mitochondria?
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उत्तर
A matured mammalian erythrocyte lacks a nucleus and mitochondria. The lack of a nucleus
increases the surface area-volume ratio of RBCs, thus increasing the area for oxygen absorption.
Also, the lack of a nucleus reduces the size of the cell, making it easy to flow through the blood
vessels and more cells can be accommodated in a small area.
The lack of mitochondria implies that the cell does not use any oxygen absorbed for respiration,
thus increasing the efficiency of the cell to transport oxygen as all the oxygen absorbed is
transported without any loss.
संबंधित प्रश्न
The diagram given below represents a section of the human heart. Answer the questions that follow :
(i) Which parts of heart are in the diastolic phase? Give a reason to support your answer.
(ii) Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
(iii) What causes the heart sounds ‘LUBB’ and ‘DUP’?
(iv) Name the blood vessels that supply oxygenated blood to the heart muscles.
(v) Draw neat labelled diagrams of a cross section of an artery and a vein.
Name the following:
The smallest common blood vessels formed by the union of capillaries.
Given below is a certain structure, write its chief functional activity.
Blood platelets - ______
what is Lymph nodes?
How do you account for the following difference?
The walls of the right ventricle are thicker than those of the right auricle.
Choose the correct answer:
English physician who discovered blood circulation was ___________
Why is circulatory system also known as transport system?
______ WBCs are present per mm3 of blood.
Ventricles have ______ walls when compared with those of auricles.
Name these:
Three circulating fluids in human body.
