Q10 of 38 Page 93

Name the protein and the blood-cells responsible for the clotting of blood.

The protein responsible for clotting of blood is Fibrinogen. It accounts for 4% of all plasma proteins. The blood cells responsible for clotting of blood are blood platelets. When a blood vessel is damaged, the vessel wall’s cell releases a sticky substance. Platelets stick and accumulate at the area of injury and hence form a clot.


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Name the three important blood proteins seen in plasma. Add a note on their functions.

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Which blood cells are without nuclei? What is the advantage of this condition?

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i) What are the structural and functional units of kidney?

ii) Arrange the organs of the human excretory system in the correct order, based on the passage of urine.


Ureter, Urethra, Kidney, Urinary bladder


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Observe the following flow-chart depicting blood-circulation in mammals.


Pick out the correct blood vessels A, B, C, D from the following:


i) Pulmonary veins


ii) Venacava


C. Pulmonary artery


D. Aorta


Among the P,Q,R and S samples, identify the correct match from the following


a) P & Q = Oxygenated and R& S = Deoxygenated


b) P & Q = Deoxygenated and R& S = oxygenated


c) All are Oxygenated


d) All are Deoxygenated