When a nerve impulse reaches the end of an axon, the neurons release chemicals that carries the signal across the synapse.

a. action potential

b. steriods

c. neurotransmitters

The correct answer for the fill in the blank is- C) Neurotransmitters.

Neurotransmitters are the chemical messengers in the body that help in the transmission of signals from one neuron to another neuron across a gap called synapse ( such as neuromuscular junction).

These chemicals are released from synaptic vesicles that are present in the nerve endings and also from some glands (like adrenal gland and pituitary).

Example of neurotransmitters- Dopamine, acetylcholine, serotonin.

your answer should be c) enjoy!

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )