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प्रश्न
Mature RBC in mammals does not have cell organelles.
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उत्तर
The RBCs are devoid of the nucleus, mitochondria ribosome, and endoplasmic reticulum. The absence of these organelles accommodates more haemoglobin thereby maximizing the oxygen-carrying capacity of the cell. Biconcave shape increases the surface area for oxygen binding, loss of mitochondria allows the RBC to transport all the oxygen to tissues, and loss of endoplasmic reticulum allows more flexibility for RBC to move through the narrow capillaries.
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संबंधित प्रश्न
What are the components of blood?
What makes the blood look red?
What are the various components of blood? State their functions.
The liquid connective tissue A circulates in our body continuously without stopping. This tissue contains a pigment B which imparts it a colour C. The tissue A consists of four components D, E, F and G. The component D fights infection and protects us from diseases. The component E helps in the clotting of tissue A if a person gets a cut. The component F is a liquid which consists mainly of water with many substances dissolved in it and component G carries oxygen from the lungs to all the parts of the body.
(a) What is (i) tissue A (ii) pigment B, and (iii) colour C?
(b) Name (i) D (ii) E (iii) F, and (iv) G.
(c) Name one substance (other than oxygen) which is transported by tissue A in the human body.
(d) Which two components of tissue A are the cells without nucleus?
(e) Name any two organisms ( animals) which do not have liquid like A in their body.
All veins carry deoxygenated blood.
Why are leucocytes classified as granulocytes and agranulocytes? Name each cell and mention its functions.
Direction: In each of the following questions a statement of assertion (A) is given and a corresponding statement of Reason (R) is given just below it. Mark the correct statement as.
Assertion: Persons with AB blood group are called a universal recipient because they can receive blood from all groups.
Reason: Antibodies are absent in persons with AB blood group.
Single circulation i.e. blood flows through the heart only once during one cycle of passage through the body, is exhibited by
Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.
Find out about blood groups and their importance.
