Chapter 11 - Endocrine Glands Flashcards
secrete hormones into the blood
endocrine glands
precursors for prohormobes
prehormones
precursors of hormones
prohormones
What is the purpose of a pro hormone?
for the enhancement and strengthening of a hormone that already exists in the body
are derived from tyrosine and tryptophan
amines (thyroid hormone and catecholamines)
chains of amino acids
polypeptides and proteins
proteins bound to carb groups include LH FSH and TSH
glycoproteins
derived from cholesterol (sex hormones and adrenal gland hormones)
steroids
small chemical messengers that travel through our bloodstream to target cells
hormones
when two or more hormones work together to produce a particular result
synergistic
When the action of one hormone enhances the responsiveness of the target organ to a second hormone.
permissive effect
When the action of one hormone is inhibited by another hormone
antagonistic effect
chronically low levels of hormone in ECF leads to increase of number and sensitivity of protein receptors for that hormone —– upregulation
priming effect
– chronically high levels of hormone in the ECF leads to decrease in the number and sensitivity of protein receptors for that hormone
– Prevented by pulsatile secretions
Downregulation/Desensitization