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Capillaries
Nothing, blood vessels are nothing because they wont harm you or anything like that.
dilate
It causes them to dilate not constrict.
The term Elastic Arteries usually refers to the ability of blood vessels to dilate and constrict freely.
When body temperature drops below normal, dermal vessels are likely to constrict to maintain core body temperature, limiting heat loss through the skin. In contrast, when body temperature is elevated, the vessels in the dermis are likely to dilate to help the body release excess heat.
Pupils don't dilate from light, the constrict. They dilate in the dark, to take in more light, and constrict in the light so your eyes don't get damaged. Hallucinogenics, stimulants and alcohol and make your pupils dilate and opiates and diazepam can make them constrict. Im not sure what that's called though..
Almost all the veins and arteries constrict and dilate during heavy exercise. Even capillaries bring a flush to the face and skin by dilation.
Quite the contrary actually. Smoking will raise blood pressure and dilate vessels. Hope this helps!
dilates them
Blood vessels are surrounded by very small circular muscles which contract and relax to allow blood vessels to constrict and dilate. The vessels also contain elastin which allows them to stretch.
blood vessels. doppus