Question

b)
What is meant by breathing?
How is external respiration different from internal respiration?
How do fish breathe Draw a diagram showing the breathing organ and its exact
location in the body of a fish​

Answer 1

Answer:

The process of respiration, during which air is inhaled into the lungs through the mouth or nose due to muscle contraction and then exhaled due to muscle relaxation.

External respiration is the exchange of gases with the external environment, and occurs in the alveoli of the lungs. Internal respiration is the exchange of gases with the internal environment, and occurs in the tissues. The actual exchange of gases occurs due to simple diffusion.

Respiration in fish takes place with the help of gills. ... Fish take in oxygen-rich water via their mouths and pump it over their gills. When water moves over the gill filaments, the blood within the capillary network takes up the dissolved oxygen.