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Endocrine 14 & 11
Herlihy & Adult Health
| Question | Answer |
|---|---|
| Adenohypophysis | Anterior pituitary gland |
| Adrenal glands | Endocrine gland; consists of outer cortex and inner medulla |
| Catecholamines | Hormones secreted by the adrenal medulla; norepinephrine and epinephrine |
| Endocrine glands | Ductless glands that secrete hormones, usually into the blood |
| Hormone | Secreted by a endocrine gland into the blood |
| Neurohypophysis | Posterior pituitary gland; secretes oxytocin and antidiuretic hormone |
| Pancreas | Contains both endocrine and exocrine functions |
| Parathyroid glands | Secretes parathyroid hormone and helps regulate calcium balance |
| Pineal gland | Located in the brain; secretes melatonin and involved in regulating biorhythms |
| Steroids | Lipid-soluble hormone such as estrogen, testosterone and cortisol |
| Thymus gland | Lymphoid organ that plays an important role in immunity |
| Thyroid gland | Secretes T3, T4 and calcitonin |
| Greek meaning of "hormone" | "To arouse or to set into motion" |
| Endocrine system communicates through... | Chemical signals called hormones |
| Endocrine glands | Secrete hormones |
| Hormone | Chemical messenger that influences or controls the activities of other tissues or organs |
| Endocrine system and hormones help regulate... | Metabolic processes involving carbohydrates, proteins and fats |
| Study of the endocrine system | Endocrinology |
| Receptors located on the outer surface of the cell membrane | Membrane receptors |
| Receptors located within the cell | Intracellular receptors |
| How do hormones recognize their target tissues? | Lock and key |
| Specificity | Specific hormone for each receptor |
| Negative feedback loop | "Enough is enough" |
| Positive feedback loop | "Give me more" |
| Biorhythm | Rhythmic alteration in a hormone's rate of secretion |
| Circadian rhythm | 24-hour rhythm that repeats every 24 hours |
| Pituitary gland location | In a depression of the sphenoid bone |
| 2 parts of the pituitary gland | Anterior pituitary gland and posterior pituitary gland |
| Secretion of the anterior pituitary gland | Controlled by the hypothalamus |
| Hypothalamus considered to be a... | Endocrine gland |
| How do the hypothalmic hormones reach the anterior pituitary gland? | Secretes its hormones into a network of capillaries |
| Connecting capillaries called... | Hypothalamic-hypophyseal portal system |
| Anterior pituitary gland secretes... | 6 major hormones |
| Anterior pituitary gland often called... | Master gland |
| Hormones of the anterior pituitary gland | TSH, ACTH, GH, gonadotropins and PRL |
| TSH | Thyroidstimulating hormone |
| ACTH | Adrenocorticotropic hormone |
| GH | Growth hormone |
| PRL | Prolactin |
| HGH target organ | Whole body |
| ACTH target organ | Adrenal cortex |
| TSH target organ | Thyroid |
| FSH target organ | Ovaries and testes |
| LH target organ | Ovaries and testes |
| Prolactin target organ | Mammary glands |
| Anterior pituitary hormones | HGH, ACTH, TSH, FSH, LH, Prolactin |
| Oxytocin target organ | Mammary glands and uterus |
| ADH target organ | Kidneys |
| Posterior pituitary hormones | Oxytocin and ADH |
| FSH | Follicle-stimulating hormone |
| LH | Lutenizing hormone |
| ADH | Antidiuretic hormone |
| HGH action | Stimulates growth and development |
| ACTH action | Effects kidneys, BP, sodium and potassium levels |
| TSH action | Regulates metabolism, growth and development |
| FSH action | Stimulates development of graffian follicle in females; stimulates development of sperm in men |
| LH action | Stimulates release of egg and formation of corpus luteum in females; stimulates development of sperm in males |
| Prolactin action | Stimulates milk production |
| Oxytocin action | Stimulates milk release, stimulates contractions |
| ADH action | Decreased urine production |
| What does the thyroid need to function? | Iodine |
| Thyroid gland location | Anterior neck, on front and sides of trachea, butterfly shaped |
| Thyroid hormones | T3 and T4 |
| T3 and T4 actions | Growth and development, metabolism, and maturation of nervous system |
| Hypothyroidism results in... | Myxedema |
| Myxedema | Slowed down metabolic state |
| If infant is born without thyroid gland, results in... | Cretinism |
| Cretinism causes... | Failure to develop both physically and mentally |
| Hyperthyroidism | Speeded up metabolic state |
| Hyperthyroidism results in... | Grave's disease |
| Exophthalmia | Bulging eyes |
| Calcitonin action | Decreased calcium; antagonist of parathormone |
| What hormone stimulates secretion of T3 and T4? | TSH |
| Iodine deficiency causes... | Hypothyroidism |
| How many parathyroid glands are located along the posterior gland? | Four |
| Parathyroid gland secretes... | PTH; parathyroid hormone |
| What stimulates release of PTH? | Low blood level of calcium |
| Parathormone actions | Increases blood calcium, decreases blood phosphorus |
| Osteoblastic | Bone-making |
| Where are the adrenal glands located? | Above the kidneys |
| Two regions of adrenal glands | Inner medulla and outer cortex |
| Adrenal medulla secretes... | Norepinephrine and epinephrine |
| Epinephrine and norepinephrine categorized as... | Catecholimines |
| Adrenal cortex secretes... | Steroids |
| Steroids | Lipid0soluble hormones made from cholesterol |
| Three steroids secreted by the adrenal cortex | Glucocorticoids, mineralocorticoids, and sex hormones |
| Glucocorticoids function | Sugar |
| Mineralocorticoids function | Salt |
| Sex hormones function | Sex |
| Chief glucocorticoid | Cortisol |
| Cortisol secreted during... | Times of stress |
| Chief mineralocorticoid | Aldosterone |
| Female sex hormones | Estrogens |
| Male sex hormones | Androgens |