Question

1. since cell membranes are permeable to only some molecules but no others, the membrane is called ___________. the wall of ______ vessels, like those that move water between the blood and the matrix of the brain, are an example.

Explanation:

Cell membranes allow certain molecules to pass through while blocking others, which is the definition of a semi - permeable membrane. Blood vessels that regulate the movement of water between the blood and the brain matrix are also semi - permeable as they control the passage of substances.

Answer:

semi - permeable membrane; blood