Neurotransmitters are . A. chemicals that cross the synaptic gap and bind to receptors on another neuron B. excitatory chemicals that make it more likely that a neuron will fire C. inhibitory chemicals that make it less likely that a neuron will fire D. all of these options

Option D) all of these options

Explanation:

Yes! Neurotransmitters are chemical compounds that are produced from the terminal of a neuron and bound by specific protein in the adjacent neuron where it helps to transmits a nerve impulse.

Neurotransmitters can be:

- Excitatory such as acetylcholine that cause muscle to contract and gland cells to produce secretions (i.e neuron will fire)

- Or inhibitory such as glycine which inhibits the contractions of muscles (i.e neuron did not fire)

Thus, neurotransmitters do all of the functions provided

A. chemicals that cross the synaptic gap and bind to receptors on another neuron

Explanation:

neurotransmitter are messenger that carries signals between neurons and other body cell. They operate through neurotransmission

This is done by transmission of signals between neurons. Neurons are not linked together and for signals to be transmitted it have to cross over though a space called synapse between this neuron to another neuron.

Neurotransmitter control brain activity and some other body activity such as heart rate,food appetite,fear,fright.

what are the choices?

the electromagnetic energy from the sun arrives in the form of visible and invisible light.