Question

Describe the steps in breathing.

Hint:

Breathing relies on pressure changes driven by diaphragm and intercostal muscle movements.

Answer 1

Breathing involves:
1. Inspiration: Diaphragm contracts, thoracic cavity expands, intrapulmonary pressure decreases, air enters lungs.
2. Expiration: Diaphragm relaxes, thoracic cavity contracts, intrapulmonary pressure increases, air is expelled.
Answer: Inspiration (air intake via diaphragm contraction) and expiration (air expulsion via relaxation).