Question

The function of choroid plexus is
A) To produce lymph
B) To produce blood
C) To produce cerebrospinal fluid
D) To produce endolymph

Answer 1

Hint: The choroid plexus is the complex network of blood vessels lined with the specialized ependymal cells. It is present in each ventricle of the brain. It produces a clear, colorless body fluid found in the brain that is responsible for buoyancy and provides protection to the brain from.

Complete answer:
The choroid plexus also known as the plica choroidea is a plexus of cells that arises from the tela choroidea in each of the four ventricles of the brain. The choroid plexus is lined by the specialized ependymal cells that are responsible for the production of cerebrospinal fluid (CSF). CSF is thus produced and secreted by the regions of the choroid plexus.

Additional information:
CSF acts as a medium for the lymphatic filtration system that facilitates the removal of metabolic wastes from the brain and allows the exchange of biomolecules and xenobiotics into and out of the brain.
CSF also provides the protective buoyancy for the brain and thus acts as a shock absorber.
The choroid plexus is also a major source for the secretion of transferrin that plays a part in iron homeostasis in the brain as transferrin is the transporter of iron in the body.

Hence the correct option is C i.e. to produce cerebrospinal fluid.

Note: The blood and CSF formed a barrier in the brain i.e, known as the blood-cerebrospinal fluid barrier. It is composed of a pair of membranes that separate blood from CSF at the capillary level and CSF from brain tissue.In embryo, CSF-brain barrier is present at the level of the pia mater.Blood-CSF barrier is functioned as to prevent the passage of most blood-borne substances in the brain, while selectively permitting the passage of specific substances into the brain and also facilitate the removal of brain metabolites and metabolic products into the blood.