17) What crosses the membrane to cause an action potential? Neurotransmitters Ho
ID: 3503036 • Letter: 1
Question
17)
What crosses the membrane to cause an action potential?
Neurotransmitters
Hormones
Sodium ions
Water molecules
14)
How do the synapses responsible for taste and smell differ from those for vision and hearing?
The synapses for taste and smell react more slowly and their effects last longer.
The synapses for taste and smell occur only in the spinal cord and not in the brain.
The synapses for taste and smell have effects that are expressed more widely in the brain.
The synapses for taste and smell have inhibitory effects; vision and taste are excitatory.
12) What route does a neurotransmitter follow?
The sympathetic nervous system sends it to the parasympathetic nervous system.
The presynaptic cell sends it to the postsynaptic cell.
The chromosomes send it to the mitochondria.
A dendrite sends it to an axon.
a.Neurotransmitters
b.Hormones
c.Sodium ions
d.Water molecules
Explanation / Answer
Answer-17- (c) Sodium ions
Action potential occurs when different ions cross the membrane. First of all, sodium channels are opened by a stimulus because many more sodium ions are on the outside that rush into the neuron.
Answer-12- (b) The presynaptic cell sends it to the postsynaptic cell
A released neurotransmitter is pulled back into the presynaptic neuron through reuptake, or bound to a postsynaptic receptor.
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