Endocrine

Endocrine - cells ii. Thyroid hormone (Thyroxine or T-4) -...

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1Endocrine hormones slow longer lasting effects, ongoing processes Nervous nerve impulses - neurotransmitters fast immediate effects 1. Hormone - chemical messenger produced by cells, released into blood, affect only target organs a. Direct - lipid based (steroid based), pass directly through target cell’s membrane b. Indirect - protein based, need intermediate receptor to get into membrane 2. Endocrine glands - ductless, go directly into the blood 3. Endocrine system - major control system a. Pituitary gland “Master Gland” i. Anterior (1) Growth hormone (GH) (2) Prolactin - milk production (3) *FSH - eggs and sperm (4) *LH - ovulation in females, testosterone in males (5) *TSH - Thyroid stimulating hormone (6) *ACTH - stimulates adrenal gland cortex (7) Ultimate control is by hypothalamus —> produces releasing and inhibiting hormones ii. Posterior - releases hormones (1) Oxytocin - uterine contractions, milk let down (2) ADH - decreased urine production b. Thyroid gland i. Calcitonin - decreases Calcium levels in blood - made by parafollicular
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Unformatted text preview: cells ii. Thyroid hormone (Thyroxine or T-4) - follicle cells - major metabolic hormone c. Parathyroid gland i. PTH - increases Calcium in blood d. Adrenal gland - sits on top of the kidney i. Cortex (1) Mineralocorticoids - aldosterone (water balance) (2) Glucocortoids - cortisone (increase blood glucose, decrease edema) (3) Sex hormones - androgens ii. Medulla - inside portion - behaves more like nervous tissue (1) Catecholamines - epinephrine, NE - controlled by hypothalamus e. Thymus gland i. Thymosin (immunity) - shrinks in adulthood f. Pancreas i. Insulin - Beta cells, regulates blood glucose —> decreases glucose, deficiency = diabetes ii. Glucagon - Alpha cells, increase blood glucose, target organ is liver g. Pineal gland - melatonin, determine day/night h. Gonads i. Ovaries (1) Estrogen, progesterone ii. Testes (1) Testosterone...
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This note was uploaded on 04/10/2008 for the course BIOL 109 taught by Professor Mister during the Spring '08 term at UMBC.

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Endocrine - cells ii. Thyroid hormone (Thyroxine or T-4) -...

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