Question

question 7 of 10
why would a lack of neurotransmitters cause a problem in the nervous system?
a. neurotransmitters are the cells of the nervous system
b. if there are not enough neurotransmitters, signals will travel too quickly
c. neurotransmitters carry signals in the blood
d. neurotransmitters are how signals move from neuron to neuron

Explanation:

Neurotransmitters are chemical messengers that transmit signals across the synaptic gap between neurons. Without them, signal transmission between neurons would be disrupted. Option A is incorrect because neurons are the cells of the nervous system, not neurotransmitters. Option B is wrong as a lack of neurotransmitters would slow down or stop signal transmission, not make it too fast. Option C is incorrect as neurotransmitters act at synapses (not carried in the blood like hormones for long - distance signaling in the endocrine system).

Answer:

D. Neurotransmitters are how signals move from neuron to neuron