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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
Haemoglobin is present in ______ cells.
Give appropriate biological or technical terms for the following :
The complex consisting of a DNA strand and a core of histones
Given below is a certain structure, write its chief functional activity.
Erythrocytes - ______.
Given below is a certain structure, write its chief functional activity.
Lymphocytes - ______.
How do you account for the following difference?
The left ventricle has thicker walls than the right ventricle.
Give reason for the following:
The walls of the left ventricle are thicker than the walls of all other chambers.
Give reason for the following:
Blood flowing away from the stomach and intestines is put into circulation via the liver and
not directly.
Find out my partner.
| Group 'A' | Group 'B' |
| 1. Heart beats | a. 350 ml |
| 2. RBC | b. 7.4 |
| 3. WBC | c. 37∘C |
| 4. Blood donation | d. 72 |
| 5. Normal body Temperature | e. 50-60 lakh/mm3 |
| 6. pH of oxygenated blood | f. 5000-6000 per mm3 |
Fill in the blanks with suitable words given below:
The two lower chambers of the heart are called ______.
Write a short note on the human heart.
