18. Give reasonseMucus is secreted in the gastric juice inside the sto

1.	18. Give reasonseMucus is secreted in the gastric juice inside the stomach.Rate of respiration in aquatic organisms is higher than terrestrialorganismsArteries have thick, elastic walls
Answer» a)Mucus is secreted by the stomach wall because the hydrochloric acid secreted by gastric glands is corrosive in nature.So the secreted mucus prevents the inner wall of the stomach from corroding. b)The rate of respiration in aquatic animals is higher than that of the terrestrial animals because the amount of dissolved oxygen in water is less than the amount of oxygen in air.So in order to compensate the requirement of oxygen these animals breathe quickly. c)Arteries have thick and elastic walls because the blood from heart comes with higher pressure.In order to prevent it from rupturing the walls of arteries are thick and elastic.

18. Give reasonseMucus is secreted in the gastric juice inside the stomach.Rate of respiration in aquatic organisms is higher than terrestrialorganismsArteries have thick, elastic walls

Answer»

a)Mucus is secreted by the stomach wall because the hydrochloric acid secreted by gastric glands is corrosive in nature.So the secreted mucus prevents the inner wall of the stomach from corroding.

b)The rate of respiration in aquatic animals is higher than that of the terrestrial animals because the amount of dissolved oxygen in water is less than the amount of oxygen in air.So in order to compensate the requirement of oxygen these animals breathe quickly.

c)Arteries have thick and elastic walls because the blood from heart comes with higher pressure.In order to prevent it from rupturing the walls of arteries are thick and elastic.

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