Multiple choice

_____ muscle is used for the respiration.

  1. Pectoralis major

  2. Diaphragm

  3. Phalanges

  4. Femur

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

The diaphragm is the primary muscle of respiration. When it contracts, it flattens, increasing the volume of the thoracic cavity and allowing air to be drawn into the lungs.