Which of the following is an effect of acetylcholine?: (A) Relaxes LES, (B) Contracts LES, (C) Constricts the blood vessels, (D) Relaxes the bronchial muscles
Answer is B. Acetyl choline is a neurotransmitter ,which is a chemical released by nerve cell ir neuron .acetyl choline causes muscle to contract,activate pain responses and regulates endocrine and REM sleep functions Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:77,78