Question

Define internal and external respiration.

Answer 1

External respiration is the exchange of gases between the atmosphere and the blood. It brings supplies for internal respiration by securing oxygen and disposing carbon dioxide.

Internal respiration is the exchange of gases between the blood and the cells of the body. It supplies oxygen to the cells and removes their gaseous waste.

Answer 2

internal respiration occurs in the metaboliging tissue where oxygen diffuse out of the blood and CO2 diffuse out of the cells