Examlex
Helper T (TH) cells recognize antigens when they are bound to a(n) __________.
Precapillary Sphincter
A ring-like muscle at the entrance of capillaries that regulates blood flow into the capillary.
Atrial Natriuretic Hormone
A hormone, secreted by heart's atria, that regulates blood pressure by reducing sodium ion concentration in the blood, thus decreasing blood volume.
Vasopressin
A hormone produced by the pituitary gland that helps regulate water balance in the body and constriction of blood vessels.
Angiotensin II
A peptide hormone that causes blood vessels to constrict, increasing blood pressure.
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