Endocrine System Flashcards
What is a hormone?
A peptide or steroid produced by one tissue and conveyed by the bloodstream to another to effect physiological activity, such as growth or metabolism
Where is the pineal gland found?
In the posterior part of the epithalamus
What hormone does the pineal gland release?
melatonin
What does melatonin regulate?
The circadian rhythm (sleep cycle)
Prescription form of melatonin (sleeping pills) inhibits what?
gonadal function
What hormone do the ovaries release?
estrogen
What hormone do the testes release?
testosterone
What are the 2 hormones released by the thyroid?
triiodothyronine (T3) and thyroxine (T4)
Which thyroid hormone is converted to the other type of thyroid hormone?
T4 is converted to the active T3
Which thyroid hormone is the iodine component?
T3
What develops with low iodine levels?
goiter
What does T4 control?
the metabolic rate of all tissues
What hormone does the parathyroid hormone release?
parathyroid hormone
What is the function of the parathyroid hormone?
Maintains calcium, phosphorus, and vitamin D levels
Where are the adrenal glands located?
on top of the kidneys
