The correct option is A Both Assertion and Reason are correct and Reason is NOT the correct explanation for Assertion
Option (B) is correct.
Receptors are proteins that are crucial to body's communication process. They receives and responds to a neurotransmitter, or other substance. Majority of them are embedded in the cell membrane, in such a way their small part possessing active site projects out of the surface of the membrane and opens on the outer region of the cell membrane.