Question

question 5
determine what happens when the diaphragm contracts.
hint: select three options.
the lungs shrink
the lungs expand
air pressure in the lungs increases
air pressure in the lungs decreases
air is drawn into the lungs (inhalation)
air is forced out of the lungs (exhalation)
im not sure
question 7
determine what happens when the diaphragm relaxes.
hint: select three options.
the lungs shrink
the lungs expand
air pressure in the lungs increases
air pressure in the lungs decreases
air is drawn into the lungs (inhalation)
air is forced out of the lungs (exhalation)
im not sure

Explanation:

Question 5 (Diaphragm Contracts)

1. When the diaphragm contracts, it moves down, increasing the volume of the thoracic cavity.
2. By Boyle's law ($P_1V_1 = P_2V_2$), increased volume leads to decreased pressure in the lungs (so "Air pressure in the lungs decreases" is correct, "Air pressure in the lungs increases" is wrong).
3. The lungs expand to fill the increased space ("The lungs expand" is correct, "The lungs shrink" is wrong).
4. Lower lung pressure than atmospheric pressure causes air to be drawn into the lungs (inhalation), so "Air is drawn into the lungs (inhalation)" is correct, "Air is forced out of the lungs (exhalation)" is wrong (exhalation is when diaphragm relaxes).

1. When the diaphragm relaxes, it moves up, decreasing the volume of the thoracic cavity.
2. By Boyle's law ($P_1V_1 = P_2V_2$), decreased volume leads to increased pressure in the lungs (so "Air pressure in the lungs increases" is correct, "Air pressure in the lungs decreases" is wrong).
3. The lungs shrink due to reduced space ("The lungs shrink" is correct, "The lungs expand" is wrong).
4. Higher lung pressure than atmospheric pressure forces air out of the lungs (exhalation), so "Air is forced out of the lungs (exhalation)" is correct, "Air is drawn into the lungs (inhalation)" is wrong (inhalation is when diaphragm contracts).

Answer:

The lungs expand, Air pressure in the lungs decreases, Air is drawn into the lungs (inhalation)

Question 7 (Diaphragm Relaxes)