As CSF circulates,________ between it and the interstitial fluid of the CNS is unrestricted between and across the ependyma.
A)osmosis
B)perfusion
C)diffusion
D)convection
E)conduction

Question

Quizplus · Accepted Answer

Diffusion is the movement of solutes or particles from high to low concentration, and is unrestricted between the CSF and interstitial fluid of the CNS due to the porous ependyma. Osmosis is the movement of water across a semipermeable membrane, which is not necessarily unrestricted in this context. Perfusion refers to blood flow, and convection and conduction both involve the transfer of heat or materials through a medium, which does not apply to CSF circulation.

As CSF Circulates,________ Between It and the Interstitial Fluid of the CNS