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Definition: Angiotensin, a hormone secreted by the kidney. It promotes the dilation and constriction of blood vessels to expand and contract them during stress. The term angiotensin refers to three key proteins that are important for this process: Ang II (receptors), Ang I (activator), and Ang III (stimulator).
Definition: Angiotensin, a hormone produced in the kidneys by cells called glomeruli, helps regulate blood pressure by decreasing the force of blood rush to the heart during exercise. The term angiotensinase refers to enzymes involved in the production of this hormone. Definition: Angiotensin is an enzyme that produces the hormones that cause blood pressure to rise and fall throughout a person's body.