Question

(a) Mention any two components of blood.
(b) Trace the movement of oxygenated blood in the body.
(c) Write the function of valves present in between atria and ventricles.
(d) Write one structural difference between the composition of artery and veins.

OR

(a) Define excretion.
(b) Name the basic filtration unit present in the kidney.
(c) Draw excretory system in human beings and label the following organs of excretory system which perform following functions :
(i) form urine.
(ii) is a long tube which collects urine from kidney.
(iii) store urine until it is passed out.

Answer 1

(a)the removal of harmful waste from the body in the form of urine is known as excretion.
(b)nephron
(c)
(i)kidney
(ii)ureter
(iii)urinary bladder

Answer 2

A.) Blood consists of Erythrocytes (RBCs), Leucocytes (WBCs), and Platelets.
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B.) Oxygenated blood moves from heart via Aorta through Arteries (except pulmonary artery which carries deoxygenated blood to the lungs ) to the different parts of the bodies i.e. to each and every cell.
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C.)The main function of Valves is to prevent the backward flow of blood.
Valve between atria and ventricles have the same function as mentioned above.
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D.)Walls of arteries are thick because there is more pressure in it while the walls of veins are thin as they experience low pressure from blood as compared to arteries.
.
.
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