Q5 of 95 Page 94

Give reason for the following:

Blood flowing away from the stomach and intestines is put into circulation via the liver and not directly.

The blood flowing away from the stomach is put into circulation via the liver as liver acts like a store to regulate the quantity of nutrients. Also certain poisons if absorbed through food are detoxified in the liver.


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4

How do you account for the following differences?

(a) The left ventricle has thicker walls than the right ventricle.


(b) The walls of the right ventricle are thicker than those of the right auricle.

 5

Give reason for the following:

The walls of the left ventricle are thicker than the walls of all other chambers.

 5

Give reason for the following:

The blood groups of both the donor and recipient must be known before transfusing blood.

 5

Give reason for the following:

Only the veins and not the arteries are provided with valves.