Mod 2- Endocrine system Flashcards
what are the main secretary products of the thyroid gland
T3(thyroxin)
T4( triiodothyronine)
-both increase metabolic activity
Calcitonin- decreases blood calc conc
what are the secretory substances stored in in the thyroid
Follicles composed of simple cuboidal epi (colloid is the middle)
what are the horomones t3 and t4 bound to in the follicles
Thryroglobulin
what type of receptors does follicular cells have and what does it release
has receptor for TSH
- TSH will result in the endocytosis of T4 and T4 (steroid hormones)
What does T3 and T4 do
- increase basal metabolic rate of oxygen
- increase cardiac output
- increase systolic BP and decrease diastolic BP
What does TSH regulate
- cAMP
- synthesis of thyroglobulin
- iodine uptake
how does the body stem thyroid hormones (if body needs t3/4)
TSH will be sent to blood and receipted by follicular cells, iodine moves in and production of thyroglobulin is created, iodine is added and moves back into follicular to make t3/4
what do parafollicular cells do and where are they located
basally in epithelium don’t come in contact with follicular
secrete calcitonin that decrease calcium levels
what are the two types of cells in the parathyroid gland
Chief cells- release opposite of calcitonin (parathyroid h)
Oxyphil cell
what do chief cells secrete and what’s the function of them
Parathyroid hormone (PTH)
- help regulate calcium levels
Aspects that the adrenal gland influence
SSS
- salt
- sugar
- sex
layers of the arenal gland from out to in
capsul zona glomerulosa zona fasciculata zona reticularis medula
what is secreted in the zona glomerulosa of the adrenal gland
- secrete aldosterone
- increases reabsorption of sodium
what is secreted in the zona fasciculata of the adrenal gland
70% of cortex
–produce cortisol, increases glucose in response to stress
what is secreted in the zona reticularis
-secrete androgenic steroids that activate androgens and estrogens
