Give reasons: in one line. (a) The blood flows towards the heart in t

1.	Give reasons: in one line. (a) The blood flows towards the heart in the veins. (b) Respiration is called a catabolic process. (c) The amount of energy released during anaerobic respiration is less than the amount of energy released during aerobic respiration. (d) Lung alveoli are covered with blood capillaries. (e) The wall of trachea is supported by cartilage rings.
Answer» (a) The valves in the veins permit one – way flow of blood only. (b) It involves the breakdown of complex molecules into simple ones by oxygen. (c) Anaerobic respiration is the incomplete breakdown of glucose in the absence of oxygen. So it produces less energy. (d) Passage of oxygen from alveolar air to blood and passage of carbon dioxide from blood to alveolar air. (e) For providing support preventing collapse of trachea and allowing for uninterrupted flow of air.

Give reasons: in one line. (a) The blood flows towards the heart in the veins. (b) Respiration is called a catabolic process. (c) The amount of energy released during anaerobic respiration is less than the amount of energy released during aerobic respiration. (d) Lung alveoli are covered with blood capillaries. (e) The wall of trachea is supported by cartilage rings.

Answer»

(a) The valves in the veins permit one – way flow of blood only.

(b) It involves the breakdown of complex molecules into simple ones by oxygen.

(d) Passage of oxygen from alveolar air to blood and passage of carbon dioxide from blood to alveolar air.

(e) For providing support preventing collapse of trachea and allowing for uninterrupted flow of air.

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