Question

what happens if all the functions of the human body are controlled only by brain​

Answer 1

If all functions of human body is controlled only by brain, reflex arcs are not possible.

This means that we won't perform reflex actions.

so if we were in a dangerous and urgent situation we won't be able to respond immediately to defend our self.

Answer 2

Every organ in the body performs and it chiefly claims the activity when the mind control all exercises with body won't work appropriately.

All pieces of the human body are works yet cerebrum is controlled over every one of the pieces of the body and its organs are very unique in significantly more proficient way.

The majority of the capacities in the body are controlled and facilitated by cerebrum. Since mind controls every one of the elements of the human body when something turns out badly with it, usually genuine and can influence a wide range of parts of the body.