BIOL-UA 12 Lecture 14: Lecture 14
31 May 2016
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Lecture 14: hormones and the endocrine system: intercellular communication: Only cells with receptors complementary to hormone can receive the signal; others cannot. How signals are transmitted between animal cells are classi ed by two methods: type of secreting cell, route taken by signal to reach its target, endocrine signaling: The hormone secreted from the secretory cell goes into the bloodstream and gets carried away so it can act in a region of the body further away from the secretory cells. The target cells respond to hormone: paracrine signaling: Hormone is secreted to surrounding cells, more localized: neuroendocrine signaling: Specialized neurosecretory cells secrete molecules called neurohormones that travel to target cells via bloodstream. From tip of the axon, the roots meet the blood vessel and releases hormones into the blood stream: autocrine signaling: The receptor is on the signaling cell itself. Can also stimulate cells nearby if similar and have the receptor: pheromones:
