8. Which of these helps to pull in oxygen-rich air into the lungs?
a. Expansion of the diaphragm b. Relaxation of the diaphragm
c.Up and down movement of the ribs.
d.traceal tubes
Answers
Answered by
17
Answer:
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up and down mov of the ribs
Answered by
6
Answer:
Expansion of diaphragm
Explanation:
because when we breathe the diaphragm expands because of oxygen weight.
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