DSA 1 for Lopez Flashcards Preview

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Flashcards in DSA 1 for Lopez Deck (8):

3 classes of hormones

amino acids and peptides, steroids, and amines


peptide hormone synthesis

begins as preprohormone mRNA, and then translated by ribosomes at the ER; translocated into ER and the signal peptide is cleaved to produce a prohormone. further cleavage is done in the Golgi apparatus to produce the final peptide form. it is then stored in vesicles in the cytoplasm.


amine hormones

epinephrine, norepinephrine- made from tyrosine in the adrenal medulla


steroid hormones

cortisol, aldosterone, testosterone, progesterone, estradiol, and vitamine D

most are made in the adrenals, gonads, placenta, corpus luteum


Loop Long feedback

hormones "feedback" all the way to the hypothalamic-pituitary axis


Short loop feedback

means hormones from anterior pituitary feedback on hypothalamus


ultrashort feedback

hypothalamic hormones feedback to inhibit themselves


the primary example of positive feedback in the endocrine system

the secondary example given in the text

primary: estrogen's PFB on FSH/LH secretion

secondary is oxytocin: dilation of the cervix causes PP to secrete oxytocin. in turn, this causes uterine contractions, which further stimulates oxytocin release