Cerebrospinal Fluid

Question

Cerebrospinal fluid
A) is secreted by ependymal cells.
B) is formed by a passive process.
C) is normally produced twice as fast as it is removed.
D) has almost the same composition as blood plasma.
E) contains blood cells and blood plasma.

Accepted Answer

Cerebrospinal fluid is secreted by ependymal cells which are specialized epithelial cells that line the ventricles of the brain.

Answer: B
 Cerebrospinal fluid formation is an active process that involves the secretion of fluid by ependymal cells and a selective transport of certain molecules from the blood plasma.

Answer: C
 Cerebrospinal fluid is produced at a rate of approximately 500mL per day and is removed at a rate of about 500-600mL per day.

Answer: D
 Cerebrospinal fluid has a different composition than blood plasma, as it lacks certain proteins and ions that are present in plasma.

Answer: E
 Cerebrospinal fluid should not contain blood cells and plasma, as it is normally free of these components. The presence of these elements in the cerebrospinal fluid could be indicative of an underlying medical condition.