BIOL 3402 Lecture Notes - Lecture 1: Hypophyseal Portal System, Sella Turcica, Pituitary Gland

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30 Nov 2016
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Glands, tissues, and cells that secrete hormones. Endocrine glands: organs that are traditional source of hormones. Communicate slowly near or far and with multiple target sites as hormones are carried in the blood. Several chemicals function as both hormones and neurotransmitters: (norepinephrine, dopamine, antidiuretic hormone) Both systems can have similar effects on target cells: norepinephrine and glucagon both cause glycogen hydrolysis in liver. The 2 systems can regulate eachother: neurotransmitters can effect glands, hormones can affect neurons. Neuroendocrine cells share characteristics with both systems: neuron-like cells that secrete oxytocin into blood. Speed: nervous: reacts fast, stops fast, endocrine: reacts slow, effects last for days or longer. Adaptation: nervous: response declines (adapts fast, endocrine: response persists (adapts slow) Area of effect: nervous: targeted/specific one organ, endocrine: general/widespread effects. Releases neurotransmitters at synapses at specific target cells. Adapts relatively slowly, may respond for days to weeks. Forms floor/walls of 3rd ventricle in brain.

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