National Dental Examining Board of Canada (NDEB) Practice Exam

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Prepare for the National Dental Examining Board of Canada (NDEB) Test. Study with flashcards and multiple choice questions, each question offers hints and detailed explanations. Achieve success in your exam!

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What is the characteristic of Acetylcholine (ACh)?

Acts only on parasympathetic ganglia
Is permanently present in the body
Is rapidly hydrolyzed by cholinesterase
Acts only on sympathetic ganglia

The correct answer is: Is rapidly hydrolyzed by cholinesterase

Acetylcholine (ACh) is a neurotransmitter that is found throughout the body, including in the central nervous system and peripheral nervous system. One of the key characteristics of ACh is that it is rapidly broken down by an enzyme called cholinesterase. This means that its effects are short-lived and it cannot continuously stimulate its target cells. Option A and D are incorrect because ACh acts on both parasympathetic and sympathetic ganglia, not just one. Option B is also incorrect because while ACh is present in the body, it is not present permanently as it is constantly being broken down by cholinesterase.