CHAPTER 16: ENDOCRINE SYSTEM Flashcards
Endocrine Glands (ductless glands)
Secrete hormones directly into bloodstream to influence metabolic activities, growth, and development
Hormones
Chemical messengers secreted by endocrine glands
Pituitary Gland
Approx. size of a pea and is located at base of brain. Consists of 2 lobes
Anterior lobe (pituitary)
Produces & secretes hormones
Growth Hormone (GH)
Produced by anterior pituitary. Regulates growth of body
Adrenocorticotropic Hormone (ACTH)
Produced by anterior pituitary. Stimulates adrenal cortex
Thyroid-Stimulating Hormone (TSH)
Produced by anterior pituitary. Stimulates thyroid gland
Gonadotropic Hormones: Follicle-Stimulating Hormone (FSH) & Luteinizing Hormone (LH)
Produced by anterior pituitary. Stimulates the gonads
Prolactin or Lactogenic hormone (PRLH)
Produced by anterior pituitary. Promotes development of glandular tissue during pregnancy & produces milk after birth
Posterior lobe (pituitary)
Stores & releases antidiuretic hormone and oxytocin (both made in hypothalamus)
Antidiuretic hormone (ADH)
Produced in hypothalamus; stored in and released from posterior pituitary. Stimulates kidney to reabsorb water & constricts BVs to maintain BP
Oxytocin
Produced in hypothalamus; stored in and released from posterior pituitary. Stimulates uterine contractions during labor and postpartum, and lactation postpartum
Hypothalamus
Located superior to pituitary gland. Secretes “releasing” hormones to stimulate/inhibit release of pituitary gland hormones
Thyroid Gland
Largest endocrine gland. Located anteriorly in neck below larynx. Comprised of bilateral lobes connected by an isthmus. Produces & secretes hormones T3 & T4
Triiodothyronine (T3)
Produced by thyroid and requires iodine for production
Thyroxine (T4)
Produced by thyroid and requires iodine for production. Needed for body cell metabolism
Parathyroid Gland(s)
Four small bodies embedded in posterior aspect of thyroid lobes. Produces Parathyroid hormone (PTH)
Parathyroid Hormone (PTH)
Produced by parathyroid. Helps maintain level of Ca in blood via effects on bones & kidneys
Islets of Langerhans
Clusters of endocrine tissue found throughout the pancreas. Made up of various cell types that secrete various hormones (i.e. insulin, glucagon). Also has non-endocrine cells that secrete enzymes for digestion
Adrenal Glands
Paired glands, one superior to each kidney. Outer portion of gland is adrenal cortex and inner portion is adrenal medulla. Produces/secretes hormones.
Cortisol (hydrocortisone)
Hormone produced/secreted by adrenal cortex. Aids body during stress by increasing glucose levels in blood for energy
Aldosterone
Hormone produced/secreted by adrenal cortex. Regulates electrolyte levels (mineral salts)
Epinephrine (Adrenaline), Norepinephrine (Noradrenaline)
Hormones produced/secreted by adrenal medulla. Help body deal with stress by increasing BP, HR, & respiration rate
adren/o, adrenal/o
adrenal glands
cortic/o
cortex
endrocrin/o
endrocrine
parathyroid/o
parathyroid glands
pituitar/o
pituitary gland
thyr/o, thyroid/o
thyroid gland
acr/o
extremities, height
calc/i
calcium
dips/o
thirst
kal/i
potassium
natr/o
sodium
-drome
run, running
Acromegaly
Enlargement of extremities/face due to excessive production of GH by pituitary after puberty
Adrenalitis
Inflammation of the adrenal glands
Adrenomegaly
Enlargement of adrenal gland(s)
Hypercalcemia
Excessive Ca in blood