Os. Which of the following statement(s) is (are) true about respiration? 0) During exhalation, ribs move inwards and diaphragm is lowered. m) Exchange of pases takes place in alveoll. III) During Inhalation, ribs move outwards and diaphragm is lowered. M Haemoglobin has greater affinity for carbon dioxide. a) 1 and in b) II and III c) I and IV d) III and IV
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Answer: correct potion is b(2,3)
Explanation: During inhalation, diaphragm contraction occurs which induces the lower ribs to move upward and forward, which also increases thoracic volume. The ribs move outward because the central tendon of the diaphragm (at the crown of the dome) pushes down onto the liver and stomach, which act like a fulcrum. Oxygen enters into the alveoli. Alveoli, is the site for gaseous exchange and they increase the surface area for facilitating the process.
Carbon monoxide has 210 times greater affinity for haemoglobin than oxygen. Thus, the correct answer is option c.
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