principle of endocrine control

Question 1

peptides

Answer 1

produced by normal protein synthesis machinery
travel in blood in solution
cannot enter cells
bind to cell surface receptor
trigger an event on inside surface of membrane
fast acting

Question 2

steroids

Answer 2

produced by modification of cholesterol molecule by enzymes
travel in blood bound to plasma proteins
enter cells easily
intracellular receptor
act on DNA to later cell function
slow acting

Question 3

adrenal cortex

Answer 3

metabolic response to stress 
body sodium levels 
cortisol 
aldosterone 
DHEA - precursor hormone converted into testosterone and oestradiol

Question 4

adrenal medulla

Answer 4

fight/flight

adrenaline and noradrenaline