Actions during inhalation and exhalation

Question 1

Inhalation:

Answer 1

External: Contract

internal: Relax

Ribcage moves up and out

Diaphragm: Contract

Volume of Thorax: Increases

Pressure in thorax: lower than atmospheric pressure

Lungs inflate

Air into lungs

Question 2

Exhalation

Answer 2

External: Relax

internal: Contract

Ribcage moves down and in

Diaphragm: Relax

Volume of Thorax: Decreases

Pressure in thorax: higher than atmospheric pressure

Lungs deflate

Air out of lungs