Achemical signal that travels through the bloodstream is part of the system, while a chemical signal released into a synapse by an axon is part of the . exocrine; nervous endocrine; exocrine exocrine; endocrine endocrine; nervous

The correct answer is- endocrine; nervous

Explanation:

The endocrine system contains glands that secrete their secretion called hormone in the blood which stimulates the distant organs and cells. These hormones are important for proper working and development of organs. Some glands that come under the endocrine system are pituitary, hypothalamus, testes, thyroid, adrenal, etc.

Neurons are the basic unit of the brain which is responsible for transferring chemical signal to another neuron present in its close proximity. They are present in the brain, spinal cord, and peripheral nerves. They pass signals by their terminal end called exon into a space called the synapse. So neurons are the part of the nervous system.