Question

Define “diffusion” and explain how it happens in the lung (alveoli) and in the skeletal muscle

Answer 1

Diffusion:

Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration.

Diffusion occurs by a concentration gradient.

Diffusion in alveoli of lungs:

the gas exchange (oxygen and carbondioxide) occurs in the alveoli of lungs is by simple diffusion.

Oxygen diffuse from the alveoli to the blood.

Carbondioxide diffuse from blood to alveoli.

Diffusion in skeletal muscle:

diffusion of oxygen occurs in skeletal muscle also.