Which muscles may contract during a more forceful expiration?

(a) external intercostals.
(b) diaphragm.
(c) abdominal.
(d) both b and c.


(c) abdominal.

Biology & Microbiology

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Birds have

A. a backcurrent lung. B. an air sac lung. C. a parabronchial lung. D. a negative pressure lung. E. a tracheal lung.

Biology & Microbiology

In mammals, lungs inflate when muscles increase the size of the ______ cavity.

Fill in the blank(s) with the appropriate word(s).

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An injection of the pancreatic hormone ________ would cause blood glucose levels to fall

Fill in the blank(s) with correct word

Biology & Microbiology

How could you ethically design a scientific study to determine whether mercury-containing vaccines cause ASD?

What will be an ideal response?

Biology & Microbiology