Ch. 11-Endocrine System Flashcards
pineal gland
regulates circadian rhythms
thyroid and parathyroid glands
regulate metabolic rate and blood calcium level
adrenal glands
regulate water and electrolyte levels
pancreas
regulates blood sugar levels
pituitary gland
regulates many other endocrine glands
thymus gland
development of immune system
ovaries
regulate female reproductive system
testes
regulate male reproductive system
endocrine system
collection of glands that secrete hormones directly into the bloodstream
hormones
chemicals that act on their target organs to either increase of decrease the target’s activity level
homeostasis
maintaining a stable internal environment; endocrine system is responsible for this
exocrine glands
release hormones into a duct that carries them outside the body
endocrine glands
release hormones directly into the bloodstream, aka ductless glands
endocrine system consists of:
two adrenal glands, two ovaries, four parathyroid glands, pancreas, pineal gland, pituitary gland, two testes, thymus gland, and thyroid gland
where are adrenal glands located?
above each kidney
two sections of the adrenal gland
adrenal cortex and adrenal medulla
adrenal cortex
manufactures corticosteroids (mineralocorticoids, glucocorticoids, and steroid sex hormones)
mineralocorticoids
aldosterone, regulates sodium
glucocorticoids
cortisol, regulates carbohydrates
steroid sex hormones
androgens (may be converted to estrogen in bloodstream), regulates secondary sexual characteristics
adrenal medulla
secretes epinephrine (aka adrenaline & norepinephrine) which is important during emergency situations because it allows the body to perform better
where are the ovaries located?
lower abdominopelvic cavity, female gonads
gonads
organs that produce gametes or the reproductive sex cells
ova
female gametes
what do ovaries produce?
estrogen and progesterone
estrogen
responsible for female sexual characteristics and regulation of menstrual cycle
progesterone
maintains a suitable uterine environment for pregnancy
where is the pancreas located?
along the lower curvature of the stomach
the pancreas is the only organ that has what?
both endocrine and exocrine functions: exocrine portion releases digestive enzymes into the duodenum, endocrine section produce insulin and glucagon to regulate blood sugar
islets of Langerhans
the endocrine portion of the pancreas, named after Dr. Paul Langerhans, a german anatomist. produce insulin and glucagon
insulin
produced by beta cells, lowers blood sugar level
glucagon
produced by alpha cells, raises blood sugar level
where are the parathyroid glands located?
anterior surface of thyroid gland
parathyroid hormone
secreted by parathyroid gland, regulates calcium levels in the blood
where is the pineal gland located?
in the thalamus region of the brain
melatonin
hormone secreted by the pineal gland that regulates circadian rhythms
where is the pituitary gland located?
underneath the brain
two sections of the pituitary gland
anterior lobe and posterior lobe, both controlled by hypothalamus
anterior pituitary
secretes growth hormone (somatotropin), thyroid-stimulating hormone, andrenocorticotropin hormone, prolactin, follicle-stimulating hormone, luteinizing hormone, and melanocyte stimulating hormone
growth hormone
(GH, aka somatotropin) promotes growth in the body
thyroid-stimulating hormone
(TSH) regulates function of the thyroid gland
adrenocorticotropin hormone
(ACTH) regulates function of adrenal cortex
prolactin
(PRL) stimulates milk production in breasts after giving birth
follicle-stimulating hormone & luteinizing hormone
(FSH&LH) influence male and female reproductive organs
gonadotropins
follicle-stimulating hormone and luteinizing hormone