NEET (NTA)-National Eligibility cum Entrance Test (Medical) Biology Human Physiology-Breathing and Respiration Revision (Page 3 of 12)

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Respiratory Organs in Animals

Various organsinvolved inthe various types of respiration are

  1. Skin; exchange of gases through skin is called cutaneous respiration. Skin of these animals is thin, moist, highly vascular and easily permeable to gases. The atmospheric oxygen diffuses into the blood where it combines with the hemoglobin, present in plasma to form oxyhemoglobin. Oxyhemoglobin circulates in the tissues where it splits into hemoglobin and oxygen. Oxygen is used by the cells to oxidize food and carbon diox

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Water as a medium for respiration and adaptation in fishes

Water, as a medium is less suitable for respiration than air because

  • It is about 1000 times denser and therefore more energy is required in passing it over the respiratory surfaces.

  • Any given volume of air contains more oxygen than the same volume of water under the similar conditions.

Fishes are well developed for respiration in water. They are able to utilize upto 80% of oxygen contained in the water passing across the gill.

Factors responsible for the efficiency of fishes

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