Physiology 3120 Lecture Notes - Lecture 22: Carotid Sinus, Vasomotor Center, Preganglionic Nerve Fibers
11 Aug 2016
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Starak Leture 22
-aroreeptors lie i the alls of these to essels
RMR RA is here the lood returs uder er lo pressure
-ost lood is loated i eous sstei irulatio hih eters ito RA thus olue
reeptors are loated there
-regulated lood olue hih is related to lood pressure as ell sie lo olue auses lo
pressure
-ADH auses ater retetio thus ill irease lood olue he it is lo
-also releases rei hih auses AgII produtio that auses asoostritio hih leads to
ireased lood pressure
RMR fro efore that Ag II also stiulated thirst ad aldosteroe to retai salt ad ater i
od
-opposite ours he ireased lood olue
-so less ADH released less ater retetio to derease lood olue he it is high
-less rei released less AgII thus less asoostritio hih leads to dereased lood
pressure
-ANF released fro atrial usle ells due to strethed atriu uder high lood olue to
ause asodilatio to derease lood pressure
INPUT
Afferets fro ehaoreeptors
-aroreeptors ehaoreeptors loated i aorti arh ad arotid sius
-afferets go fro aroreeptors to edulla here the ardioasular eter is loated
-use oth eliated solid ad o-eliated dashed fiers
aorti arh aroreeptor afferet fiers i depressor ere that jois agus ere later
arotid sius aroreeptor fiers i arotid sius eres
OUTPUTS
PNS efferets
-edulla seds sigals fro CV otrol eter through agus ere RMR agal toe ie:
pregaglioi fier
-gaglio red irle is lose to heart here release Ah to sapse o to postgaglioi fier
that also releases Ah o to SA ad AV odes slo do HR ad slo do AP propagatio
to AV ode
SNS efferets
-eres trael do spial ord first ad eit spial ord at arious spots ia pregaglioi fiers
that sapse o to spatheti gaglio
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Document Summary
(cid:271)arore(cid:272)eptors lie i(cid:374) the (cid:449)alls of these t(cid:449)o (cid:448)essels. Rmr ra is (cid:449)here the (cid:271)lood retur(cid:374)s u(cid:374)der (cid:448)er(cid:455) lo(cid:449) pressure. (cid:373)ost (cid:271)lood is lo(cid:272)ated i(cid:374) (cid:448)e(cid:374)ous s(cid:455)ste(cid:373)i(cid:272) (cid:272)ir(cid:272)ulatio(cid:374) (cid:449)hi(cid:272)h e(cid:374)ters i(cid:374)to ra thus (cid:448)olu(cid:373)e re(cid:272)eptors are lo(cid:272)ated there. Regulated (cid:271)lood (cid:448)olu(cid:373)e (cid:449)hi(cid:272)h is related to (cid:271)lood pressure as (cid:449)ell si(cid:374)(cid:272)e lo(cid:449) (cid:448)olu(cid:373)e (cid:272)auses lo(cid:449) pressure. Adh (cid:272)auses (cid:449)ater rete(cid:374)tio(cid:374) thus (cid:449)ill i(cid:374)(cid:272)rease (cid:271)lood (cid:448)olu(cid:373)e (cid:449)he(cid:374) it is lo(cid:449) Also releases re(cid:374)i(cid:374) (cid:449)hi(cid:272)h (cid:272)auses a(cid:374)gii produ(cid:272)tio(cid:374) that (cid:272)auses (cid:448)aso(cid:272)o(cid:374)stri(cid:272)tio(cid:374) (cid:449)hi(cid:272)h leads to i(cid:374)(cid:272)reased (cid:271)lood pressure. Rmr fro(cid:373) (cid:271)efore that a(cid:374)g ii also sti(cid:373)ulated thirst a(cid:374)d aldostero(cid:374)e to retai(cid:374) salt a(cid:374)d (cid:449)ater i(cid:374) (cid:271)od(cid:455) (cid:271)arore(cid:272)eptors (cid:894)(cid:373)e(cid:272)ha(cid:374)ore(cid:272)eptors(cid:895) lo(cid:272)ated i(cid:374) aorti(cid:272) ar(cid:272)h a(cid:374)d (cid:272)arotid si(cid:374)us. Affere(cid:374)ts go fro(cid:373) (cid:271)arore(cid:272)eptors to (cid:373)edulla (cid:449)here the (cid:272)ardio(cid:448)as(cid:272)ular (cid:272)e(cid:374)ter is lo(cid:272)ated. Use (cid:271)oth (cid:373)(cid:455)eli(cid:374)ated (cid:894)solid(cid:895) a(cid:374)d (cid:374)o(cid:374)-(cid:373)(cid:455)eli(cid:374)ated (cid:894)dashed(cid:895) fi(cid:271)ers aorti(cid:272) ar(cid:272)h (cid:271)arore(cid:272)eptor affere(cid:374)t fi(cid:271)ers i(cid:374) depressor (cid:374)er(cid:448)e that joi(cid:374)s (cid:448)agus (cid:374)er(cid:448)e later (cid:272)arotid si(cid:374)us (cid:271)arore(cid:272)eptor fi(cid:271)ers i(cid:374) (cid:272)arotid si(cid:374)us (cid:374)er(cid:448)es.
