Blood cells and proteins typically cannot pass across the walls of capillaries and are thus prevented from leaving or entering the capillaries.

Question

Quizplus · Accepted Answer

Capillary walls are selectively permeable, allowing only small molecules like gases, nutrients, and waste products to pass through, while larger molecules like blood cells and proteins are generally retained within the capillaries.

Blood Cells and Proteins Typically Cannot Pass Across the Walls