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| noradrenaline |
a hormone secreted by the adrenal glands and released by the sympathetic nerve endings that triggers the "fight-or-flight response" and is used medically to constrict blood vessels; norepinephrine. |
| norepinephrine |
a hormone, secreted by the adrenal glands and released at the sympathetic nerve endings, that triggers the "fight-or-flight response" and is used medically to constrict blood vessels; noradrenaline. |
| pinch |
to place a tight constraint on; restrict; constrict. [1/11 definitions] |
| sphincter |
a circular band of muscle that surrounds a body opening or passage and can constrict or close it. |
| valve |
any device for controlling the flow of a fluid or gas, esp. a movable part that can close or constrict a passageway, such as a stopcock. [1/5 definitions] |
| vasopressin |
a hormone secreted by the posterior lobe of the pituitary gland which increases blood pressure by causing capillaries to constrict. |
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