▁affect s ▁the ▁ser ot on erg ic , ▁ch ol iner g ic , ▁dop am iner g ic , ▁and ▁nor adr ener g ic ▁systems , ▁all ▁of ▁which ▁are ▁key ▁to ▁maintain ing ▁regular ▁function ing ▁in ▁both ▁surv ival ▁and ▁cogn ition . ▁ ▁Ser ot on in ▁and ▁dop am ine ▁also ▁play ▁key ▁roles ▁in ▁m ood , ▁which ▁al ters ▁dr ast ically ▁with ▁men op ause ▁as ▁these ▁h orm one ▁levels ▁decrease , ▁as ▁a ▁result ▁of ▁est ro gen ▁decl ine . ▁ ▁Furthermore , ▁the ▁ratio ▁of ▁test oster one ▁to ▁est ro gen ▁changes ▁as ▁test oster one ▁is ▁now ▁of ▁higher ▁quantity , ▁causing ▁a ▁more ▁easily ▁anger ed ▁disposition ▁and ▁allowing ▁stress ▁to ▁seem ▁more ▁pre val ent ▁than ▁before ▁men op ause . ▁ ▁During ▁men op ause , ▁the ▁am yg d ala , ▁which ▁controls ▁em otion , ▁and ▁the ▁pre front al ▁cor tex , ▁which ▁regul ates ▁judgment , ▁become ▁more ▁regular . ▁Est rog ens , ▁a ▁group ▁of ▁h orm ones ▁including ▁est rad i ol ▁and ▁est r one , ▁are ▁secret ed ▁by ▁the ▁o var ies ▁and ▁the ▁secret ion ▁is ▁reg ulated ▁by ▁l ute in izing ▁h orm one ▁( L H ) ▁and ▁fol lic le ▁stim ulating ▁h orm one ▁( F SH ), ▁both ▁of ▁which ▁are ▁produced ▁by ▁the ▁p itu it ary ▁g land . ▁In ▁women , ▁est ro gen