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Autonomic nervous system (ANS)
Potion of the nervous system that relates involuntary actions, such as heart rate, digestion, and peristalsis
Leaflet
Flat, leaf shaped structure that comprises the valves of the heart and prevents back flow of blood
Lumen
Tubular space or channel writing an organ or structure of the body; space within an artery, vein, intestine, or tube
Regurgitation
Back flow or ejecting of contents through an opening
Sphincter
Circular muscle found in a tubular structure or hollow organ that constricts or dialates to regulate passage of substances through its opening
Vasoconstriction
Narrowing of the lumen of a blood vessel that limits blood flow, usually as a result of diseases, medications, or pysiological process
Viscosity
State of being sticky or gummy
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