Question

Gas exchange across the respiratory membrane in metabolizing tissue is called as
A. Internal respiration
B. External respiration
C. Breathing
D. None of the above

Answer 1

Hint:It requires the movement of gas between the bloodstream and tissues, and cellular respiration. The distribution of gas in tissues is the result of tissue surface area, blood perfusion, and gas partial pressure gradients of these tissues.

Complete answer:
Respiration is the cycle of events that occurs in the movement of oxygen and carbon dioxide between the atmosphere and the cells of the body. There is an interchange of gases between the blood and the lungs. This is considered the external breathing. The blood is moving the gases from and to the tissue cells. The sharing of gases between the blood cells and the tissue cells is internal respiration. Finally, the cells use oxygen for their particular activities which is called cell metabolism, or cellular respiration. Together, all actions are breathing.
Internal respiration is sometimes referred to as tissue respiration. The interchange of carbon dioxide and oxygen between blood and cells in various tissues is called internal respiration. Gas diffusion happens through the respiratory membrane throughout the outer metabolizing tissues, where oxygen is exchanged out of the blood and carbon dioxide is exchanged out of the cells.
External respiration is the structured term for the sharing of oxygen. It defines both the mass flow of air into and out of the lungs and the transport of oxygen and carbon dioxide into the bloodstream via diffusion.
Breathing (or ventilation) is the act of transferring air into and out of the lungs to allow the exchange of gas with the surrounding environment, often by taking in oxygen and flushing out carbon dioxide.

Thus, the correct answer is option A. i.e., Internal respiration.

Note:Respiration is an activity that results through the transfer of carbon dioxide and oxygen between the atmosphere and the cells of the body.The respiratory system interacts with the circulatory system to deliver this oxygen and to eliminate metabolism waste products. It also helps in regulating the pH level of the blood.