Questions: In the nervous system, which of the following is true of neurons and the neurotransmitters they secrete? Most neurons secrete many neurotransmitters at the same time. At any given time, a neuron is receiving a mixture of messages from the neurotransmitters. Neurotransmitters are located in the nuclei of the neurons. Neurotransmitters in neurons cannot be both excitatory and inhibitory.

In the nervous system, which of the following is true of neurons and the neurotransmitters they secrete?
Most neurons secrete many neurotransmitters at the same time.
At any given time, a neuron is receiving a mixture of messages from the neurotransmitters.
Neurotransmitters are located in the nuclei of the neurons.
Neurotransmitters in neurons cannot be both excitatory and inhibitory.

Transcript text: In the nervous system, which of the following is true of neurons and the neurotransmitters they secrete? Most neurons secrete many neurotransmitters at the same time. At any given time, a neuron is receiving a mixture of messages from the neurotransmitters. Neurotransmitters are located in the nuclei of the neurons. Neurotransmitters in neurons cannot be both excitatory and inhibitory.

Solution

The answer is the second one: At any given time, a neuron is receiving a mixture of messages from the neurotransmitters.

Explanation for each option:

Most neurons secrete many neurotransmitters at the same time.
This statement is incorrect. Typically, a neuron releases one primary neurotransmitter, although it may release more than one type under certain conditions. However, the simultaneous release of many neurotransmitters is not the norm.
At any given time, a neuron is receiving a mixture of messages from the neurotransmitters.
This statement is correct. Neurons receive inputs from multiple other neurons, which can release different neurotransmitters. These neurotransmitters can have various effects, leading to a mixture of excitatory and inhibitory messages being received by a neuron at any given time.
Neurotransmitters are located in the nuclei of the neurons.
This statement is incorrect. Neurotransmitters are stored in synaptic vesicles located in the axon terminals of neurons, not in the nuclei. The nucleus of a neuron contains the cell's genetic material and is involved in regulating its activities, but it does not store neurotransmitters.
Neurotransmitters in neurons cannot be both excitatory and inhibitory.
This statement is incorrect. Some neurotransmitters can have both excitatory and inhibitory effects depending on the type of receptors they bind to on the postsynaptic neuron. For example, dopamine can have different effects based on the receptor subtype it interacts with.

In summary, the correct statement is that at any given time, a neuron is receiving a mixture of messages from the neurotransmitters.

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