Physiology Terminology

noun an action that is performed as a response to a stimulus and without conscious thought

verb to react instinctively or automatically

adjective reflecting back, capable of reflecting light or sound

• The doctor tested my reflexes by tapping my knee with a small hammer.
• I always have a reflex to sneeze whenever I walk into a dusty room.
• His reflexes are so quick, he could dodge a bullet!
• Her reflex to apologize immediately showed her good manners.

noun the constriction of blood vessels, which increases blood pressure

• Vasoconstriction is the narrowing of blood vessels, which can lead to increased blood pressure.
• When you're cold, vasoconstriction occurs to help conserve heat in your body.
• I hate when vasoconstriction happens because my hands get all tingly and numb.
• Emotional stress can cause vasoconstriction in your blood vessels, making you feel tense and anxious.