(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.
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(a) the two components of blood are plasma, platelets ( actually there are 4 they are RBC, WBC, platelets, plasma
(b) oxygenated blood in the lungs is transported to the heart through pulmonary vein. then it enters through the left atrium and passes into the left ventricle. from the left ventricle it passes through aorta and goes to all parts of the body
(c) the valves prevent the backward flow of blood
(d) arteries have thick, elastic and muscular walls and veins have thin and few elastic walls
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(b) oxygenated blood in the lungs is transported to the heart through pulmonary vein. then it enters through the left atrium and passes into the left ventricle. from the left ventricle it passes through aorta and goes to all parts of the body
(c) the valves prevent the backward flow of blood
(d) arteries have thick, elastic and muscular walls and veins have thin and few elastic walls
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