Question

where is interal respiration held in?​

Answer 1

Answer:

Internal respiration occurs in the metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells. In either case, diffusion occurs across the respiratory membrane from a high to a low partial pressure until equilibrium is achieved.

Answer 2

Gas Exchange with Tissues

Gas exchange occurs in the alveoli so that oxygen is loaded into the bloodstream and carbon dioxide is unloaded from the bloodstream. Afterwards, oxygen is brought to the left side of the heart via the pulmonary vein, which pumps it into systemic circulation.