Question

(a) Walls of a trachea do not collapse when there is less air in it.
(b) It is necessary to separate oxygenated and deoxygenated blood in mammals and birds.
(c) Walls of Ventricles are thicker than the Auricles
(d) Lung alveoli are covered with blood capillaries.
(e) Lack of oxygen in muscles often leads to cramps among cricketers​

Answer 1

Answer:

a) Tracheal walls do not collapse when there is less air in it because it is supported by rings of cartilage.

b) In birds and mammals have a double circulation system where both the oxygenated and deoxygenated blood maintains separate. ... It is necessary for them to separate oxygenated and de-oxygenated blood so that their circulatory system is more efficient and can maintain their constant body temperature.

c) The ventricles of the heart have thicker muscular walls than the auricles. This happens because the blood from the ventricles of the heart is pumped out of the heart at greater pressure compared to the auricles. The ventricles are responsible for pumping blood to various parts of our body.

d) Alveoli present in the lungs are covered with blood capillaries so that the exchange of gases can take place between the membranes of the alveoli and the surrounding capillaries. The blood capillaries covering alveoli have a low oxygen and high carbon dioxide concentrations.

e) lack of oxygen in muscles often lead to cramps among cricketers because of the lactic acid released.