Which af the following statements is incorrect w.r.t. mechanism of breathing?
a) movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere
b)inspiration is initiated by contraction of diaphragm which increases the volume of thoracic chamber
c) Contraction of external intercostal muscles lifts up the ribs and the sternum causing decrease in the volume of thoracic chamber
d) On an average, a healthy human breathes 12-16 times/minute.
Answers
Answered by
5
Answer:
The incorrect answer is Option C - Contraction of external intercostal muscles lifts up the ribs and the sternum causing decrease in the volume of thoracic chamber
Answered by
3
The incorrect one is option C
Reason:
Contraction of external intercostal muscles lifts up the ribs and sternum and causes increase in the volume of thoracic chamber.
This increase in thoracic volume causes a decrease in the intra pulmonary pressure.
This negative pressure with that of the atmosphere forces the air from outside to move into the lungs. This is called as Inspiration
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