Which protective covering of the brain provides passageways for cerebrospinal fluid (csf) to drain into the superior sagittal sinus? a. periosteal part of the dura materb. membranous part of the dura materc. arachnoid materd. pia mater

The correct answer is C) arachnoid mater.

Explanation:

Arachnoid mater, along with pia mater and dura mater, form the meninges, a very thick membrane that protects the brain and the spinal cord. The arachnoid mater is in the middle of the other two layers and it is very important since it holds the cerebrospinal fluid (CSF) in its interior. Arachnoid mater has finger-like projections that enter the dural venous sinuses and are called arachnoid villi. These villi are responsible for the diffusion of CSF into the blood.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.