What is the difference between external and internal respiration?!?

Question

if you can answer today it will help it is for a project on the respiratory system...if you can answer e-mail me at [e-mail]...thanks ill really appreciate it.

Answer 1

External respiration, commonly known as breathing, is the exchange of oxygen and carbon dioxide between an animal and its environment. Most animals use specialized organs or organ systems, such as lungs, trachea, or gills, for external respiration.

Internal respiration is the exchange of oxygen and carbon dioxide between blood and cells in different tissues of an animal's body. Internal respiration occurs in animals with a circulation system. Animals with gills or lungs take up oxygen and transport oxygen-rich blood throughout the body; they transport carbon dioxide-rich blood from the body back into the respiratory organs where it is expelled. The oxygen-rich blood and carbon dioxide-rich blood do not mix, making for an efficient internal respiration system. Mammals and birds have a double circulation system for blood, in which separate pumps in the left and right chambers of the heart move the oxygen-rich blood in the arteries and carbon dioxide-rich blood in the veins.