Question

Select the single word in each sentence to make it correct.

1. CSF is secreted into each lateral ventricle by a choroid plexus and flows into the third ventricle. into the fourth ventricle.
2. CSF then flows down the cerebral aqueduct
3. The choroid plexus in the fourth ventricle adds more CSF.
4. CSF fills the (Click to select) space and bathes external surfaces of the brain and spinal cord.
5. At the arachnoid villi, CSF is reabsorbed into the venous blood of the (Click to select) sinuses.

Answer 1

CSF circulates through the ventricles and subarachnoid space, providing cushioning, nutrients, and waste removal for the CNS. It is produced by choroid plexuses and reabsorbed at the arachnoid villi. So the correct answer is Option 4.

Step-by-step explanation:

CSF (Cerebrospinal fluid) is secreted into each lateral ventricle by a choroid plexus and flows into the third ventricle and then into the fourth ventricle. CSF then flows down the cerebral aqueduct. The choroid plexus in the fourth ventricle adds more CSF. CSF fills the *subarachnoid* space and bathes external surfaces of the brain and spinal cord. At the arachnoid villi, CSF is reabsorbed into the venous blood of the *dural* sinuses.