ASVAB General Science Practice Test 670740

Question 2 of 5
Breathing

The diaphragm is a system of muscles that allows breathing. During inhalation, the diaphragm expands and air rushes in to fill the space created. Then, during exhalation, the diaphragm contracts and forces the air back out.

The __________ is a system of muscles that allows breathing.

diaphragm

bronchioles

trachea

pulmonary