Question

Involuntary actions are controlled by

• A. medulla in forebrain.
• B. medulla in midbrain.
• C. medulla in hindbrain.
• D. medulla in spinal cord.

Answer 1

The correct option is C

medulla in hindbrain.

The correct option is C.

Explanation for correct option-

1. The hindbrain comprises the pons, cerebellum and medulla oblongata.
2. The medulla continues posteriorly to the spinal cord and controls many involuntary actions like the beating of the heart, breathing, swallowing, coughing, salivation and vomiting.

Explanation for incorrect options-

Option A:

1. The forebrain is the largest part of the human brain that comprises two cerebral hemispheres. It regulates the voluntary activities of the body and processes sensory information.
2. The medulla is not a part of the forebrain.

Option B:

1. The midbrain is the smallest part of the human brain and is not divided into regions. It controls motor movements such as the eye's movement and is also involved in processing auditory and visual information.
2. The medulla is not a part of the midbrain.

Option D:

1. The spinal cord is a tube-like structure that extends from the medulla to the end of the vertebral column. It controls the reflex actions and relays impulses from the brain to the motor nerves of different parts of the body.
2. It does not comprise the medulla.

Final Answer: The involuntary actions are controlled by the medulla in the hindbrain.