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What causes the pupils to dilate in someone who is excited or frightened?
Wiki User
∙ 12y ago
sympathetic stimulation causes the dilator muscle to contract and sphincter muscle to relax, as a result expanding the pupil.
Wiki User
∙ 12y ago
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What causes arterioles in the damaged area to dilate during the inflammatory response?
Histamine
Does your PUPILS dilate on cocaine?
yes, i have really big pupils but im not on drugs. but if someone's pupils are dilated and dont shrink when you shine a light in their eyes their probably on drugs
When your pupils dilate are you lying?
Not necessarily. Eyes dilate for many reasons.
What is a sentence with dilate?
The drops the ophthalmologist put in my eyes made my pupils dilate.
What is it called when a person's pupils no longer dilate from the light?
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..
Can fear cause pupils to constrict?
It causes them to dilate not constrict.
What causes capillaries to dilate during inflammatory response?
Histamine
Is it true that if you say something someone likes to hear their pupils will dilate?
YES pupils will dilate when that person is interested in you
Does histamine cause blood vessels to contract?
No it causes them to dilate (vasodilation)
What causes arterioles in the damaged area to dilate during the inflammatory response?
Histamine
What causes pupils to dilate?
light.. or if someones intrerested in you then that happens as an unconcious effect
What Chemical that causes local blood vessels to dilate?
This substance is called histamine.
What causes intact capillaries near an injury dilate leaking plasma blood cells causes the blood to clot?
platelets
Does your PUPILS dilate on cocaine?
yes, i have really big pupils but im not on drugs. but if someone's pupils are dilated and dont shrink when you shine a light in their eyes their probably on drugs
What is the substance released during the inflammatory reaction that causes small blood vessels to dilate?
Histamine
What is the substance released during the inflammatory reaction that causes small blood vessels to dilate is?
Histamine
Does Vicodin dilate your eyes?
Yes, Vicodin causes pupils to become "pinned", or very small.
