capillary membranes

Capillary membranes are thin, selectively permeable layers surrounding tiny blood vessels called capillaries. These membranes allow essential substances like oxygen, nutrients, and waste products to pass between the blood and surrounding tissues. They act as a filter, controlling what enters or exits the bloodstream, while keeping larger molecules or cells confined within the blood. This careful exchange helps maintain the body's overall balance, supporting tissue health and proper function. In essence, capillary membranes are crucial gatekeepers ensuring that the body's cells receive what they need and remove waste efficiently.