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_____ refers to the narrowing of the lumen of blood vessels due to contraction of smooth muscles in the blood vessel walls, while _____ refers to the widening of the lumen due to their relaxation.

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Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.


1. _____ refers to the narrowing of the lumen of blood vessels due to contraction of smooth muscles in the blood vessel walls, while _____ refers to the widening of the lumen due to their relaxation.





 
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