ENDOCRINE SYSTEM AND BEHAVIOR
ENDOCRINE SYSTEM AND BEHAVIOR Types of chemical messenger systems : 1. Neurotransmitters - are released by axon terminals of neurons into the synaptic junctions and act locall y to control nerve cell functions. 2. Endocrine hormones - are released by glands or specialized cells into the circulating blood and influence the function of target cells at another location in the body. 3. Neuroendocrine hormones - are secreted by neurons into the circulating blood and influence the function of target cells at another location in the body 4. Paracrines- Cells produce paracrines into the extracellular fluid, which have an effect on surrounding target cells of a different type. 5. Autocrines- Autocrines are secreted into the extracellular space by cells. fluid and have an impact on the function of the same cells that they were created 6. Cytokines are peptides secreted by cells into th e extracellular f...