Which breathing action is a passive process?

A) Normal/quiet inspiration
B) Forced expiration
C) Normal/quiet expiration
D) Forced inspiration

Passive Process

A type of cellular activity that occurs without the requirement of energy input, such as diffusion or osmosis, following concentration gradients.

Forced Expiration

The act of expelling air from the lungs with effort beyond the normal, passive exhalation, often used in respiratory tests.

Normal Inspiration

The process of taking air into the lungs under normal conditions, primarily driven by the diaphragm's movement downwards.