Answer:
Option 4: hormones; neurotransmitters.
Step-by-step explanation:
Hormones are the body's chemical messengers that are released from the hypothalamus, the gonads, and the adrenal cortex. They are released into the bloodstream where they are transported to target organs and tissue.
Neurotransmitters are chemicals released by neuron which stimulates other neurons, muscle cells and gonad cells allowing for the passage of impulse from one cell to another one.