BIO210Y5 Lecture Notes - Lecture 19: Pituitary Gland, Adrenal Gland, Pineal Gland

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8 Jan 2018
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Direct: ion, solute, lipid-soluble material exchange between adjacent cells via tight (gap) junction. Synaptic: neurotransmitter exchange in specific areas via synapses. Paracrine: paracrine factors exchanged locally through ecf, target cells have specific receptors. Autocrine: as paracrine, but limited to cell that secretes the chemical signal. Endocrine: hormone exchange between distant tissues and organs via bloodstream. Hypothalamus: maintains fluid balance, smooth muscle contraction, control secretion of anterior pituitary hormones. Pituitary gland: secretes hormones that regulate adrenal cortex, thyroid gland, reproductive organs, and melanin. Adrenal glands: secrete hormones for mineral balance, metabolic control, and stress resistance. Pineal gland: secretes melatonin (affects reproduction and circadian rhythms) Attach to specific hormone receptors extracellularly or intracellularly. Physiological response (enzymes activated or inhibitory effect on cell) Hormone receptors associated with g proteins which regulate secondary messengers. Physiological response (enzymes activated or inhibitory effect on cell) achieved through a 2nd messenger (camp, ca2+)

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