Question

1b) Controlling centre of involuntar
activities is
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Answer 1

Answer:

These vital mechanisms are controlled by one of the brain's most durable parts--the brain stem. The brain stem is an automatic control center for many such important involuntary actions of the body. And, it is a pathway for impulses travelling back and forth between the body and the rest of the brain.

Explanation:

The involuntary actions include breathing, pumping action of the heart, peristalsis and control of blood pressure. The medulla oblongata is part of the brain stem that controls most of these involuntary actions (The brain stem is the posterior part of the brain that is continuous with the spinal cord.

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Answer 2

Answer:

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These vital mechanisms are controlled by one of the brain's most durable parts--the brain stem. The brain stem is an automatic control center for many such important involuntary actions of the body. And, it is a pathway for impulses travelling back and forth between the body and the rest of the brain.