Endocrine System Ch.14 Flashcards
adren/o…adrenal/o
adrenal glands
calc/o
calcium
crin/o
secrete
gluc/o…glyc/o…glycos/o
sugar, sweetness
home/o
same, alike
kal/i
potassium
pancreat/o
pancreas
parathyroid/o
parathyroid glands
thym/o
thymus gland
thyr/o…thyroid/o
thyroid gland
toxic/o
poison
-crine
secrete
-dipsia
thirst
-gen
forming, producing, origin
-toxic
pertaining to poison
-uria
urine
eu-
good, normal
exo-
outside, outward
hyper-
excessive, above normal
hypo-
under, below
poly-
many, much
Structure and function of endocrine system
- consists of endocrine (ductless) glands
- secretes hormones directly into bloodstream
- control and integration of many bodily functions (acts with the nervous system)
Endocrine system: Chemical messengers
Chemical messengers (hormones), travel through blood and lymph, until they reach target organ(s) that have the right hormone receptor, and then the affect takes place.
Hormone producing and releasing structures
- pituitary gland
- thyroid gland
- parathyroid
- adrenal glands
- pancreas
- pineal and thymus glands
- ovaries and testes
Pituitary gland
-tiny, pea shaped structure at the base of the brain
-known as the “master gland”
-stimulation of other glands to secrete their own specific hormones
-secretes antidiuretic hormone (ADH), oxytocin,
adrenocorticotropic hormone (ACTH), follicle-stimulating hormone (FSH), growth hormone (GH), luteinizing hormone (LH), prolactin, and thyroid-stimulating hormone (TSH).
Thyroid gland
- Two lobes on either side of the trachea.
- largest endocrine gland in the body
- secretes calcitonin, triiodothyronine (T3), thyroxine (T4)
Parathyroid gland
- two pairs of pea shaped organs located on the posterior aspect of the thyroid.
- secrete parathyroid hormone (PTH)
Pancreas
- elongated organ located just below the stomach in back of the abdomen
- secretes insulin and glucagon
Pineal gland
- small pinecone shaped organ located deep within the brain just behind the thalamus.
- secretion of melatonin, which influences the maturation of sexual organs during puberty.
Thymus gland
- butterfly shaped organ located between the lungs.
- withers away during puberty.
- secretes thymosin
Ovaries
- part of both endocrine and female reproductive systems
- secretes estrogen (estradiol) and progesterone
Testes
- part of both endocrine and male reproductive systems
- secretes testosterone.
ADH
Antidiuretic hormone (vasopressin).
- regulates urinary output, increase water reabsorption from the kidneys.
- role in blood pressure regulation.
Oxytocin
- inducement of labor in pregnant women by stimulating contractions in he uterus
- promotion of milk secretion from the mammary glands.
ACTH
Adrenocorticotropic hormone, which regulates the production of steroid hormones by the adrenal gland.
FSH/LH
- Follicle-stimulating hormone, which stimulates egg production in the ovaries or sperm in the testes.
- Luteinizing hormone, which stimulates production of sex hormones by the ovaries or testes.
GH
Growth hormone (somatotropin), regulates growth of bones and other tissues.
Prolactin
stimulates growth of breast tissue and milk production in females.
TSH/TH
thyroid-stimulating hormone, which regulates activity of the thyroid gland.
- thyroid gland secretes three hormones
- calcitonin: regulates normal blood levels of calcium and phosphate
- T3: increases the rate of cellular metabolism
- T4: increases the rate of cellular metabolism after being converted to T3 in the tissues.
PTH
Parathyroid hormone.
- regulates normal blood levels of calcium and phosphate (in conjunction with calcitonin)
- functions include
- stimulates osteoclasts to digest bonde matrix
- enhances reabsorption of Ca2 by the kidneys
- promotes activation of vitamin D (by the kidneys)
Insulin and Glucagon
- insulin: removes glucose from the blood by promoting storage in tissues as carbohydrates when blood glucose levels are high.
- glucagon: stimulates the release of sugar from storage sites in the liver when blood glucose levels are low.
Melatonin
Influences the maturation of sexual organs during puberty
Thymosin
Plays a role in development of the immune response in infants.