Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
True statement about the respiratory process in human, is/are : (1) Human males use thoracic rib cage and dia phragm for breathing while females use only thoracic rib cage (2) In normal expiration the diaphragm is arched (3) High temperature of body promates accelerated breathing (4) The rate of respiration is slowest while eating foodA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 1,2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: A
Solution :
Inspiration is a process by which fresh air enters the lungs. The diaphragm, intercostals muscles and abdominal muscles play an important role. Expiration is a process by which the foul air \[(C{{O}_{2}})\] is expelled out from the lungs. Expiration is a passive process. Human males use thoracic cavity and diaphragm while females use only thoracic cavity. In expiration the muscle fibres of the diaphragm relax making it convex decreasing volume of the thoracic cavity. High temperature of body increases breathing rate.
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