_____ is a neurotransmitter that slows down heart rate, whereas _____ speeds it up.
A) Acetylcholine; norepinephrine
B) Epinephrine; norepinephrine
C) Norepinephrine; acetylcholine
D) Epinephrine; acetylcholine
Correct Answer:
Verified
Q2: The synapse between two neurons is surrounded
Q3: _ are membranous compartments that hold several
Q4: Chemicals released by a neuron onto a
Q5: The axon terminal is formed by the
Q6: Neurons in which the ion channels from
Q7: Parkinson disease is linked with the loss
Q8: Acetylcholine helps _ muscle contraction in the
Q9: Compared with chemical synapses, electrical synapses:
A)transmit messages
Q10: Electrical synapses _ in mammals.
A)are not present
Q11: Electron microscopy is a useful tool in
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