4. (a) "The breathing cycle is rhythmic whereas exchange of gases is a

1.	4. (a) "The breathing cycle is rhythmic whereas exchange of gases is acontinuous process". Justify this statement.(b) What happens if conducting tubes of circulatory system developsa leak? State in brief, how could this be avoided?(c) How opening and closing of stomata takes place? [CBSE (CCE)2011]
Answer» 4.a)The breathing cycle involves inhalation and exhalation of air. One inhalation and one exhalation makes one breathing cycle. When we breathe in the thoracic cavity expands and when we breathe out the thoracic cavity contracts. Thus breathing is a rhythmic process. But the gas inhaled reaches to each and every cell through blood. So the exchange of gases is a continuous process as it takes place between the blood and each and every cell, by diffusion. b)If conducting tubes of a circulatory system develops a leak, the blood clots. After a leak the number of platelets would get increased that minimize the leakage and inactive thrombin becomes active thrombin in the presence of thromboplasm. This active Thrombin converts the inactive fibrinogen into active fibrin and it results with a clot. But, if a person does not develop with blood clot, immediate medical attention must be given. Otherwise it may lead to death. c)

4. (a) "The breathing cycle is rhythmic whereas exchange of gases is acontinuous process". Justify this statement.(b) What happens if conducting tubes of circulatory system developsa leak? State in brief, how could this be avoided?(c) How opening and closing of stomata takes place? [CBSE (CCE)2011]

Answer»

4.a)The breathing cycle involves inhalation and exhalation of air. One inhalation and one exhalation makes one breathing cycle. When we breathe in the thoracic cavity expands and when we breathe out the thoracic cavity contracts. Thus breathing is a rhythmic process. But the gas inhaled reaches to each and every cell through blood. So the exchange of gases is a continuous process as it takes place between the blood and each and every cell, by diffusion.

b)If conducting tubes of a circulatory system develops a leak, the blood clots. After a leak the number of platelets would get increased that minimize the leakage and inactive thrombin becomes active thrombin in the presence of thromboplasm. This active Thrombin converts the inactive fibrinogen into active fibrin and it results with a clot.

But, if a person does not develop with blood clot, immediate medical attention must be given. Otherwise it may lead to death.

4. (a) "The breathing cycle is rhythmic whereas exchange of gases is acontinuous process". Justify this statement.(b) What happens if conducting tubes of circulatory system developsa leak? State in brief, how could this be avoided?(c) How opening and closing of stomata takes place? [CBSE (CCE)2011]

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