Respiration consists of which processes?

Respiration consists of which processes?

• A. Intake and output
• B. Inspiration and expiration
• C. Systole and diastole
• D. Dilation and contraction

Answer: (B)

Respiration is the two-phase process of taking air into the lungs and moving air out. Inspiration is the active phase where the diaphragm and intercostal muscles expand the chest to draw air in. Expiration is the phase where air leaves the lungs as the chest cavity relaxes or contracts during active breathing. Among the options, only inspiration and expiration describe this breathing cycle; the other terms refer to fluid intake/output, heartbeats, or generic dilation/contraction and don’t capture the breathing sequence.

Respiration is the two-phase process of taking air into the lungs and moving air out. Inspiration is the active phase where the diaphragm and intercostal muscles expand the chest to draw air in. Expiration is the phase where air leaves the lungs as the chest cavity relaxes or contracts during active breathing. Among the options, only inspiration and expiration describe this breathing cycle; the other terms refer to fluid intake/output, heartbeats, or generic dilation/contraction and don’t capture the breathing sequence.