Multiple choice

What happens to diaphragm at the time of inspiration?

  1. It expands

  2. It contracts

  3. It relaxes

  4. Remains unchanged

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During inspiration (breathing in), the diaphragm contracts, drawning downward, creating a vacuum in the thoracic cavity. This vacuum inflates the lungs by drawing air into the body through the trachea, or windpipe.