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Human Physiology, 7/e
Stuart I Fox, Pierce College
The Autonomic Nervous System

Critical Thinking Exercises

Please answer all questions



1

If a person has been nerve gassed (i.e. exposed to one of the anticholinesterases), one symptom of the condition may be pin-point pupils. Please explain.
2

Angry people can often be seen to have very dilated pupils. Why?
3

The tobacco plant produces nicotine, several giant toadstools produce muscarine, and certain nerve gases (originally produced to kill people) are used as insecticides: what do all of these facts tell us about an insect's neurons?
4

The muscles controlling pupil constriction are cholinergic. The cholinesterase is inhibited thus allowing the acetylcholine to stay in the synaptic gap longer and overstimulating the constrictors.








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