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Cards In This Set
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Gap Junctions
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Cytoplasm to cytoplasm connections through pores
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Neurotransmitters
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Communcation across the cleft to receptors
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Pacrines
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"next to" "secrete". Local hormones that go into tissue fluid and DIFFUSE to a nearby cell in same tissue.
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Hormones
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Chemical messengers from endocrine glands/cells. Goes into blood stream. Stimulates physiology in another tissue. Only affects target cells.
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Target Cells
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Specific cell for specific hormone. often diff. cells bind to same hormone (widespread effects)
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Hypothalamus (function)
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Water balance & child birth. (Many functions of hypothalamus are carried out by Pituitary Gland)
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Anterior Pituitary Gland (function)
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Anterior lobe (adenohypothesis) - connected with VESSELS (not neurons)
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Posterior Pituitary Gland (function)
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Posterior lobe (nuerohypothesis) - mass of neuroglia and nerve fibers (not a true gland), synthesizes hormones and stores
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Hypothalamus (hormones)
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Prolactin Releasing Hormone (PRH), Prolactin Inhibiting Hormone (PIH), GnRH, GHRH
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Prolactin Releasing Hormone (PRH)
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Increases prolactin hormone, PRL
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Prolactin Inhibiting Hormone (PIH)
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Decreases prolactin hormone, PRL
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Pituitary Gland (hormones)
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{Table 17.4} Growth Hormone
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Growth Hormone
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Leads to widespread tissue growth. increased protein synthesis (DNA expression). increased metabolism & fat breakdown. electrolyte balance change.
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Pituitary Gland (control)
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Hypothalamus, Cerebrum & FEEDBACK from Organs.
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Negative Feedback
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When hormone's target organ sends inhibiting message to stop hormone (ex. pituitary/thyroid axes)
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