What is the choroid plexus specialized to do?

What is the choroid plexus specialized to do?

• A. Secrete CSF
• B. Absorb CSF into venous sinuses
• C. Produce myelin
• D. Regulate cerebral blood flow

Answer: (A)

Choroid plexus is specialized to secrete cerebrospinal fluid. It sits within the brain ventricles and is made up of a layer of ependymal cells with tight junctions and a dense capillary network. These epithelial cells actively transport ions (such as Na+, Cl−, and HCO3−) using pumps and transporters, which creates an osmotic gradient that pulls water into the ventricle to form CSF. This process produces the CSF that cushions the brain, maintains chemical stability, and helps remove waste; the choroid plexus also helps establish the blood-CSF barrier to protect the CNS. Absorption of CSF into venous sinuses happens via arachnoid granulations, not the choroid plexus. Myelin is produced by oligodendrocytes, and regulation of cerebral blood flow is managed by neurovascular coupling in the brain’s vessels.

Choroid plexus is specialized to secrete cerebrospinal fluid. It sits within the brain ventricles and is made up of a layer of ependymal cells with tight junctions and a dense capillary network. These epithelial cells actively transport ions (such as Na+, Cl−, and HCO3−) using pumps and transporters, which creates an osmotic gradient that pulls water into the ventricle to form CSF. This process produces the CSF that cushions the brain, maintains chemical stability, and helps remove waste; the choroid plexus also helps establish the blood-CSF barrier to protect the CNS. Absorption of CSF into venous sinuses happens via arachnoid granulations, not the choroid plexus. Myelin is produced by oligodendrocytes, and regulation of cerebral blood flow is managed by neurovascular coupling in the brain’s vessels.