Diffusion Through Cell Membranes

How to breathe in and out                                                             

Ventilation is for breathing in                                                       

1. Intercostal muscles and diaphragm contracts

2. The throax volume increases

3. This decreases the pressure, drawing air in

And breathing out

1. Intercostal muscles and diaphragm relax

2. The throax volume decreases

3. This…