Ch20 (Endocrine System) Flashcards
these are ductless and allow hormones to travel through bloodstream
endocrine glands
a ____ can only affect organs that have receptors for it specifically
hormone
this type of loop will turn down secretion of hormones as the levels get high
negative feedback
this type of loop senses oxytocin levels increasing, which increases contraction from the uterus and more oxytocin is secreted
positive feedback
_____ is a major control center of the endocrine system
hypothalamus
name the three functions of the hypothalamus
(1) secretes regulatory hormones that control the release of anterior pituitary hormones, (2) produces oxytocin & antidiuretic hormones, (3) controls the simulation of the adrenal gland medulla
this gland is attached via infundibulum, housed in sella turcica of sphenoid bone, and divided into anterior & posterior lobes
pituitary gland or hypophysis gland
this gland secrets many hormones and is highly vascular
anterior pituitary gland or adenohypophysis
_____ act on other endocrine glands
tropic hormones
this hormone promotes growth & development of all body parts during stages of growth
growth hormone (GH)thi
this hormone promotes gamete production & stimulates estrogen production
follicle-stimulating hormone (FSH)
this hormone stimulates sex hormone secretion
luteinizing hormone (LH)
this hormone stimulated secretion of thyroid hormones
thyroid stimulating hormone (TSH)
this hormone regulates secretion of hormones from adrenal cortex
adrenocorticotropic hormone (ACTH)
this hormone stimulates milk production
prolactin (PRL)
this hormone is a body’s natural painkillers
endorphins
________ is the hyposecretion of growth hormones during childhood
pituitary dwarfism
________ is the hypersecretion of growth hormones during childhood
gigantism
________ is the hypersecretion of growth hormones during adulthood
acromegaly
hormones synthesized by the hypothalamus are stored in the _______
posterior pituitary gland
this hormone reduces fluid loss through urine
antidiuretic hormone/vasopressin
this hormone induces contraction of uterine muscles during childbirth
oxytocin
this gland is a small, cone-shaped body in the posterior epithalamus, and secretes melatonin
pineal gland
this gland is butterfly-shaped and secrets calcitonin and thyroxine
thyroid gland
_____ lowers blood calcium levels
calcitonin
_____ regulates digestion, heart & muscle function & brain development
thryoxine
this condition is a cause of the thyroid gland not working properly or a lack of iodine
hypothyroidism
this condition is hyposecretion during the first months of life
cretinism
this condition is caused by hypersecretion of the thyroid hormone, can be caused by graves disease
hyperthyroidism
these are small glands on the posterior surface of the thyroid gland
parathyroid glands
these hormones raise blood calcium levels if they get too low
parathyroid hormones (PTH)
two pairs of hormones having opposite effects but work together to maintain homeostasis
antagonistic hormones
the ____ secrets thymosin and is larger in infants/children than adults
thymus
this hormone helps develop mature T cells (immune function)
thymosins
these glands sit on the superior borders of the kidneys
adrenal glands
this cortex is an outer part on the adrenal glands and produces 3 types of corticosteroid hormones
adrenal cortex
this cortex is an inner part of the adrenal gland and secretes fight or flight hormones
adrenal medulla
this hormone influences mineral balance
aldosterone/mineralocorticoids
this hormone reduces inflammation
cortisol/glucocorticoids
this hormone contributes to the development of male sex characteristics
androgens/gonadcorticoids
these two hormones are the fight or flight response for the sympathetic nervous system
norepinephrine & epinephrine
this organ secretes insulin and glucagon
pancreas
this hormone lowers blood sugar levels if they are too high
insulin
this hormone raises blood sugar levels if they get too low
glucagon
this condition is a lack of insulin secretion and is an early onset
Type 1 diabetes
this condition is normal or increased insulin secretion but reduced sensitivity of insulin target cells, late onset
Type 2 diabetes
the ____ produces sex hormones & germ cells
gonads
this hormone promotes breast development & menstrual cycke
estrogen
this hormone maintains lining of uterus during pregnancy
progesterone
this organ produces androgens such as testosterone
testes