<u>substrate</u> fits into the <u>active site</u>, so the answer is C
Atropine would block the receptor called muscarinic acetylcholine receptors present in the eye.
Atropine is the Anticholinergic agent which is also known as parasympatholytics. The activity of neurotransmitters at the receptors leads to pupil constriction.
Atropine is used to block these receptors that allow the pupillary muscles to relax. This causes the dilation of the pupil.
Atropine is the mydriatics that is used for pupillary dilation to conduct a detailed examination of eye diseases.
without this medication, the pupil will only dilate in the darkness. However, doctors cannot examine the eye problems as there is darkness as they need light for checkups.
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