Lung Function Respiratory Module 2

Question 1

what occurs during inspiration (breathing in)

Answer 1

Diaphragm contracts and flattens, ribs move up and out, causing the volume of the chest to increase and air pressure decreases in the lungs

Air fills the extra chest volume and increases lung air pressure

Question 2

what occurs during expiration (breathing out)

Answer 2

Diaphragm relaxes, and ribs and other structures return to their resting position

Chest cavity volume decreases causing lung air pressure to increase

Air is forced out to make inside and outside air pressure equal