Why is physiology called one of the prime branches of biology?

Why is physiology called one of the prime branches of biology?

Physiology is called one of the prime branches of biology. This branch of biology deals with the biochemical activities of different organs of organisms. Besides, a detailed description of all the physiological processes of organisms is found in it.  With all of these physiological processes, organism can't do their regular activities. That's why physiology is called one of the prime branches of biology.