External respiration takes place in?

External respiration takes place in the lungs.

External respiration takes place in the lungs

Explanation:

External respiration takes place in the lungs, in the exchange process of carbon dioxide (CO2) and Oxygen (O2). This means that in the lungs, oxygen diffuses into the blood and carbon dioxide diffuses into the alveoli (smallest functional structure of the lungs). In order to understand the difference, in the other hand we have internal respiration which occurs in metabolizing tissues, where the exchange of oxygen and carbon dioxide occurs in the cells.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.