A) the amount of freely available oxygen
B) carbon dioxide
C) muscular functions of the body
D) stress
E) All of the above
Correct Answer: B
Solution :
Breatirig is entriely under nervous control. A respiratory centre, located bilaterally in medulla oblongata and pons varoli of the brain not only regulates normal breathing, but also automatically adjusts the breathing rate to the varying requirements of body during various Stress conditions such as exercise, fear, pain, anger, fever, worry, etc., and in activities like speaking, playing a musical instrument, yogic exercises, etc., because of this oxygen\[(P{{O}_{2}})\]and carbon dioxide\[(PC{{O}_{2}})\] in blood remain almost static in all conditions. Also we may voluntarily hold our breath for some time, but not for a longer time due to this nervous control.
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