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प्रश्न
Give reason for the following:
Blood flowing away from the stomach and intestines is put into circulation via the liver and
not directly.
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उत्तर
The blood from stomach and intestines enters the liver via hepatic portal vein because the
liver monitors all the substances that have to be circulated in body. The excess nutrients such
as glucose, fats are stores in the liver. Excess amino acids are broken down by the process
deamination. Toxic substances are detoxified.
संबंधित प्रश्न
Aqueous humour, Vitreous humour, lris, Central canal
When a doctor is recording your pulse, he is pressing on your wrist exactly on a
Match the items in Column ‘A’ with those in column ‘B’ Rewrite the correct matching pairs.
| Column A | Column B | ||
| (a) | SA Node | (i) | Plasma |
| (b) | Defective haemoglobin in RBC | (ii) | Serum |
| (c) | Muscle fibres located in heart | (iii) | Pacemaker |
| (d) | The liquid squeezed out of blood during clotting | (iv) | Sickle cell anaemia |
| (e) | Never tires, keep on contracting and relaxing | (v) | Purkinje fibres |
| (f) | Cardiac cycle | (vi) | Cardiac muscle |
| (g) | Liquid part of the blood without corpuscles | (vii) | 0·85 sec |
Give reason for the following:
Only the veins and not the arteries are provided with valves.
Explain the following:
Why is the closed circulatory system more efficient than the open system?
During surgical operations or during accidents, the patient may be given blood from outside to save his life. What is the technical name of this process? Briefly explain the precautions to be taken in this process.
True or false:
Blood group A has antigen A.
Thin tube-like structures which are the component of circulatory system are called blood vessels.
A resting person usually has a pulse rate between 72 to 80 beats per minute.
Name the following :-
The cell organelle where photosynthesis occurs
