Neurotransmitters Are

question 18

Multiple Choice

Neurotransmitters are:

• A) neurochemicals that are released into the synapses of neurons and which diffuse in milliseconds across synaptic gaps to activate or inhibit the receiving neuron or muscle fiber.
• B) substances that are carried in the blood to affect organs that are sensitive to them.
• C) diverse in size, including small molecules like adrenaline and larger molecules like peptides.
• D) neuro-modulators that are released by some neurons and that diffuse some distance to affect many thousands of nearby neurons.

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