Question

The human brain weight approximately ……...% of the body weight.
A. 1%
B. 2%
C. 5%
D. 10%

Answer 1

Hint: The brain is the central information processing organ of our body.

Complete answer:
The brain is the most important part of CNS which controls all the voluntary functions along with vital activities like circulation and respiration in the body. The brain also stores memory. The emotions of the person are also perceived by the brain. It also maintains the normal temperature of the body.

Additional Information
The characteristics of the brain are as follows:
1. The brain lies in the cranium of the skull.
2. The adult human brain weighs approximately about 1,300-1,400 g.
3. Therefore, the adult human brain is about 2% of the total body weight.
4. Brain and spinal cord are surrounded by connective tissue membranes called meninges.
5. There are 3 meninges in humans; they are Dura mater, Arachnoid mater and Pia mater.
6. Anatomically cerebrum and cerebellum form the major parts of the brain.
7. About 80% of the brain weight is contributed by Cerebrum.
8. The total volume of cerebrospinal fluid (CSF) is 125-150 ml
9. The volume of the brain is 1400 cc in adults.
10. CSF (cerebrospinal fluid) is a clear extracellular fluid present in ventricles of the brain, in the subarachnoid space, in the central canal of spinal fluid.

So, the correct answer is ‘2%’.

Note:
1. The cerebrum is a major part of the brain which consists of two hemispheres joined by a band known as the corpus callosum.
2. Cerebral hemispheres have groves running on it which are called sulci. This forms elevated folds on the surface which are known as gyri (singular - gyrus).
3. On the cut section, the outer part of cerebrum is known as the cortex (grey matter) while the inner part is known as medulla (white matter).
4. CSF acts as a cushion and protects the brain from mechanical injuries.
5. Medulla continues further as the spinal cord.