HUMB1000 Lecture Notes - Lecture 12: Adrenal Medulla, Adrenal Gland, Endocrine System

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A tropic hormone is one that acts on another endocrine gland. Non-tropic are hormones that only act on their target cell to produce an effect. Characteristics of the es: body control system where regulation requires duration rather than speed, glands that secrete chemical messengers (hormones) into circulatory system (blood, hormone characteristics. Acts on target tissues elsewhere in body: hormone secretion can be: Acute - sudden release due to stimulus, e. g. adrenaline in response to stress. Chronic small variations over long periods, e. g. thyroid hormones. Episodic e. g. estrogen & progesterone during menstrual cycle: target cells respond to a hormone because they have the correct receptor. Similarities: both systems associated with the brain. Endocrine hypothalamus: may use same chemical messenger as neurotransmitter and hormone. E. g. epinephrine: two systems are cooperative e. g. some parts of endocrine system innervated directly by nervous system (adrenal medulla) Differences: mode of transport, speed of response.

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