Question

Most of the involuntary actions are controlled by:
A. Medulla oblongata
B. Cerebrum
C. Cerebellum
D. Diencephalon

Answer 1

Hint: Brain is the main controlling centre of the body; it is divided into three parts- forebrain, midbrain and hindbrain.

Complete answer:
The involuntary actions are controlled mainly by Medulla oblongata. The human brain has three parts namely- forebrain, midbrain and hindbrain. The hindbrain is divided into three parts – Pons, medulla and cerebellum.
Mostly, involuntary actions which take place in the body are controlled and coordinated by medulla of the hindbrain. Actions like blood pressure, salivation etc. are controlled by medulla. The foremost region of the brain is the forebrain which consists of the cerebrum, which controls the main thinking part of the body;this region is specialized with the sense organs and also known to control the voluntary actions of the body. The middle part of the brain is the midbrain which acts as the connecting link between the forebrain and the hindbrain. It is associated with the control of some involuntary actions of the body.
The cerebellum region of the hindbrain is associated with the functions like the precision of the decision making of the body and also controls the posture and balance of the body. Cerebellum is also the part of the hindbrain but it performs and controls different functions from that of medulla.

So, the correct answer is (A).

Note: The brain as being the delicate organ of the body needs to be protected from any kind of the injury and shocks thus it is covered by the bony skeleton known as cranium or skull and it is filled with the cerebrospinal fluid which functions as the shock absorber and thus helps in the protection of the brain.