Exercises For each of the following statements describe the change in pupil size

Question

Exercises For each of the following statements describe the change in pupil size. a Intense parasympathetic nerve firing. b. Administration of atropine, a muscarinic blocker c. Administration of phenylephrine, an alpha agonist Administration of a parasympatholytic agent such as belladonna (a parasympatholytic agent is generally called anticholinergic, antimuscarinic, or muscarinic blocker). d. (belladonna means "beautiful lady", a reference to the pupillary effect of the drug.) e. Administration of a sympathomimetic agent f. Intense sympathetic nerve firing g. A person who has experienced a closed head injury; increased intracranial pressure (IIP). h, with regard to IP, explain the significance of the term "fixed and dilated pupils" i. With regard to drug overdose, describe "pinpoint pupils".

Explanation / Answer

a) Intense parasympathetic nerve firing will dilate the pupil.

b) Administration of atropine will dilate the pupil.

c) Administration of phenylephrine will dilate the pupil of eye.

d) Belladonna drops act as a muscarinic antagonist, blocking receptors in the muscles of the eye that constrict pupil size. So, administration of belladonna will dilate the pupil.

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