Respuesta :
Answer:
is formed in the choroid plexuses of all four brain ventricles.
Explanation:
Cerebrospinal fluid is a colorless, clear body fluid which is found in brain and spinal cord. Â
It is secreted by some special ependymal cells which are present in choroid plexuses of ventricles of brain, and are absorbed in arachnoid granulations.
It acts as a buffer for brain. It provides basic immunological and mechanical protection to brain which is present inside the skull.
Options that are wrong, there reasons:
(a) is an effective barrier against all poisons and drugs has the same chemical composition as blood plasma.
(b) has more protein and less sodium and chloride ions than blood plasma
Reason - CSF is derived from the blood plasma. It is similar to it except that it is protein-free compared with that of plasma and some electrolytes like sodium chloride.
