Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
A. gamma aminobutyric acid
B. cholinesterase
C. norepinephrine
D. acetylcholine
Answer:D
Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
A. gamma aminobutyric acid B. cholinesterase C. norepinephrine D. acetylcholine