Question

The function of cerebrospinal fluid does not include
A. Protection of the delicate brain and spinal cord from shock.
B. Protection of brain and spinal cord by containing antibodies.
C. Buoyancy to the brain.
D. As a medium for excretion of waste product.

Answer 1

Hint: A clear colourless fluid that surrounds the brain and the spinal cord of all the vertebrates is called cerebrospinal fluid. It performs the function of protection and acts as a mechanical barrier against any shock or damage. It lowers the impact of force and also maintains a constant pressure within the cranium.

Complete Step by Step Answer:
The cavities of the central nervous system are referred to as the ventricles that are lined by the choroid plexus. Choroid plexus is rich in blood vessels and are formed by the inserted pia mater and ependymal cells. The production of cerebrospinal fluid (CSF) is the function of the choroid plexus. The CSF plays various functions such as:- it removes all the waste material from the brain and the spinal cord and ensures the effective working of the central nervous system. It also distributes nutrients to the cerebrum and the spinal cord. It protects the brain and spinal cord as it acts as a shock absorber and thus provides mechanical support to the brain. It gives buoyancy to the brain.
CSF does not contain any antibody to provide protection.

Thus, the correct answer is option:- B.


Note: Cerebrospinal fluid helps in homeostasis. It contains glucose, sodium, urea, calcium and chloride. The cerebrospinal fluid helps in the diagnosis of diseases of the brain and the spinal cord or any other condition that may affect the efficiency of the central nervous system. The CSF is used for the diagnosis of infectious diseases of the brain and spinal cord such as meningitis and encephalitis, autoimmune diseases such as multiple sclerosis, bleeding in the brain, brain tumors and Alzheimer's disease.