Chapter 9 Endochrine System Reverse Flashcards
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Scientific study of glands/cells and hormones
Endochrinology
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Chemical messengers
Hormones
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communicates with hormones
releases hormones into blood but only target cells respond
causes change in metabolic activites of target cells
reacts slowly (seconds to days)
may continue long after stimuli stops
Endochrine System
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communicates with electrical impulses and neurotransmitters
releases neurotransmitters at synapses with target cells
relatively local, specific effects, muscles contract or glands secrete
reacts quickly
stops quickly
Nervous system
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Hypothalmus
Pituitary
Thyroid
Pancreas
Adrenal
Gonads: ovaries and testes
Major Endochrine Glands
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Growth hormone secreted by gland
directs growth of skeletal muschel and bone
Pituitary Gland
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Pituitary dwarfism
gigantism
acromegaly
Homeostatic imbalances of Growth Hormone
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hyposecretion of GH during childhood
person max 4ft
Pituitary Dwarfism
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hypersecretion of GH during childhood
extremely tall
Gigantism
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hypersecretion of GH in adults
facial bones, hands and feet enlarge
Acromegaly
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stimulates powerful contractions during childbirth
pitocin: synthetic oxytocin used to induce or hasten labor
Oxytocin
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Thyroxin- major hormone
stored in colloid of follicles
regulates body metablolism, important for normal development of nervous system
Thyroid Gland
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enlargement of thyroid gland when body
deficient in iodine
Goiter
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Cretinism
Myxedema
Homeostatic imblances of thyroxine
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hyposecretion of thyroxine in children results in mental retardation
Cretinism
