Intense heat has a negative impact on an organism, and heat loss is inhibited by the intense vasoconstriction. Given these facts, intense _ has a negative impact on an organism among the following options:
- dilation
 - contractions
 - vasoconstriction
 - chemical reaction
 - energy of moving objects
 - Greenhouse gasses
 - digestion
 - electromagnetic energy


 

   vasoconstriction      