Examlex
Why must the adaptive immune system develop a capacity to discriminate between foreign antigens and host antigens?
Exchanges Nutrients
The process by which cells, tissues, or organisms take in nutritional substances and expel waste products.
Blood Pressure
The force exerted by circulating blood on the walls of blood vessels.
Arteriovenous Anastomosis
Vessel through which blood is shunted from an arteriole to a venule without passing through the capillaries.
Arteriole
A small artery that leads into capillaries, controlling blood flow and pressure by the contraction and relaxation of its muscular wall.
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