BIOL 2312 Lecture Notes - Lecture 45: Growth Hormone–Releasing Hormone, Adrenal Medulla, Thyroid

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15 Dec 2017
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Chapter 45: endocrine system: direct contact, synaptic signaling, endocrine signaling, paracrine signaling. Neurotransmitters:-axons and neurons secrete chemical messengers called neurotransmitters into the synaptic cleft. Chemicals diffuse only a short distance to the post synaptic membrane. Hormone: -regulatory chemical that is secreted into extracellular fluid. Active in small concentrations (10^-8 to 10^-10 m) Endocrine glands: organs specialized to secrete hormones (liver and kidneys also release hormones) Endocrine system: organs and tissues that produce hormones collectively. Blood: carries hormones to every cell in the body but only target cells with receptors for the given hormone can respond to it. Receptor binds to specific hormone activate signal transduction pathway produce response to hormones. Paracrine regulators: other molecules that act within an organ on nearby cells as local regulators. Autocrine signaling: signaling molecules that affect their own behavior. Seen in cancer cells that may release growth factors that stimulate their own growth.

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