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Chap 8 terms

Anatomy and Physiology Key Terms

TermDefinition
autonomic nervous system (ANS) Portion of the nervous system that regulates involuntary actions, such as heart rate, digestion, and peristalsis
leaflet Thin, flattened structure; term used to describe the leaf-shaped structures that compose a heart valve
lumen Tubular space or channel within any organ or structure of the body; space within an artery, vein, intestine, or tube
regurgitation Backflow or ejecting of contents through an opening
sphincter Circular muscle found in a tubular structure or hollow organ that constricts or dilates 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 physiological processes
vasodilation Widening of the lumen of a blood vessel caused by the relaxing of the muscles of the vascular walls
viscosity State of being sticky or gummy
Created by: Esuvill0