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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 table below is designed to indicate the transport of certain substance in our body. Fill in the
blanks with suitable answers.
| Substance | From | To |
| Lungs | Whole body | |
| Carbon dioxide | ||
| Urea | ||
| Digested carbohydrates |
Intestines | |
| Target organs |
Define the Arteries.
What is the Rh-factor?
Differentiate between:
Arteries and Veins.
The stomach is like a ______.
All the waste products of the body are excreted through the circulatory system.
A female has haemophilic brother and parents having nonual blood clotting. She marries a male who has no history of haemophilia in his family. What is the possibility of her children having this disease?
Name the following :-
The cell organelle where photosynthesis occurs
The heart is covered by ______.
Name these:
Two kinds of circulatory systems in different animals.
