Endocrine System Flashcards
Endocrine system
- Ductless system
- non-localized response
Hormones that are proteins
Insulin and prolactin
Hormones which are peptide chains
Antidiuretic hormone and oxytocin
Steroid hormones
- Cholesterol derivatives
- Testosterone & estradiol
Catecholamines
Norepinephrine and epinephrine
What is known as the master gland?
Pituitary gland
what connects the pituitary to the hypothalamus ?
Infundibulum
Subdivisions of the pituitary
Neurohypophysis and the adenohypophysis
divisions of the neurohypophysis
pars nervosa, infundibular stalk, and median eminence
Posterior lobe of the neurohypophysis
Pars nervosa
Hormones secreted by the neurohypophysis
Oxytocin & antidiuretic hormone
subdivisions of the adenohypophysis
pars distalis, pars intermedia, and pars tuberalis
Anterior lobe of the pituitary
par distalis
what secretes tropic hormones
Adenohyophysis
Cell types in the pars distills
- Lactropic cells
- thyrotropic
- somatotropic
- coricotrophic
- gonadotropic
Lactotropic
Secretes prolactin
Thyrotropic cells
secretes thyroid stimulating hormones
Somatotropic cells
secrete growth hormone
corticotropin cells
Secrete adrenocorticotropic hormone & melanocyte-simulating hormone
Gonadotropic cells
secrete follicle stipulating hormone and luteinizing hormone
Classification of cells of the anterior pituitary
acidophils or basophils
Acidophils
- Somatortophic & lactotropic
- secretes growth hormone and prolactin
Basophils
- gonadotropic cells, corticotropic cells and thyrotropic cells.
- secrete FSH, LH, ACTH, and TSH.
Pineal gland
-Secretes melatonin
Cells of the pineal glands
Pinealocytes
‘brain sand”
Corpora arenacea
Corpora arenacea
calcification seen in the pineal gland
Thyroid gland
-secretes the thyroid hormones and calcitonin
Cells of the thyroid
follicular cells and parafollicular cells
C-cells
- Parafollicular cells
- secrete calcinin
Parathyroid
contains two cell types : principal and oxyphyil cells
Pancreas
-both endocrine and exocrine
Endocrine portion of the pancreas
-Housed in the islets of langergans
Islets of langerhans
-most numerous in the tail of pancreas
contains alpha, beta and delta cells
Alpha cells
secretes glucagon
Beta cells
Secretes insulin
Delta cells
secretes somatostatin
Acini
exocrine portion of the pancreas
Adrenal glands
-composed of the adrenal cortex and the adrenal medulla
layers of the adrenal cortex
zona glomerulosa, zona fasciculata, and zona reticularis
Name the products of the layers of the adrenal cortex
zona glomerulosa=principle products
zona fasciculata=glycocorticoids
zona reticularis = sex steroids
cells of the adrenal medulla
Chromaffin cells
What do chromatin cells secrete ?
They secrete the catecholamines (epinephrine and norepinephrine).
Sertoli cells
- produce inhibin and androgen-binding protein
- sustentacular cells or nurse cells
The interstitial cells of Leydig
-produce testosterone
Ovary
Secrete estrogen and progesterone
Placenta
Secretes human chorionic gonadotropin
Thymus
Produces thymosin
Stomach
- Produces gastrin
- gastrin stimulates the production of HCl and pesin
Small intestines
-secretin and CCK produces here
Secretin
-stimuates the pancreas to produce bicarbonate
CCK
Stimulates gallbladder contraction and the pancreas to secrete digestive enzyme
Heart
Specialized cells produce atrial natriiuretic hormone, or atriopeptin.