WGU D236 Pathophysiology Section 1 Homeostasis Study Guide and Exam Prep

WGU./,Patho./,D236./,Section./,1./,Homeostasis


Course./,Code:./,D236
Course./,Name:./,Pathophysiology
Topic:./,Homeostasis,./,Fluid,./,Electrolyte,./,and./,Acid-Base./,Core./,Bank
Academic./,Year:./,2026/2027




1../,As./,Diane./,completes./,her./,marathon./,race,./,what./,dynamic./,compensator
y./,responses./,enable./,her./,body./,to./,maintain./,homeostasis./,despite./,her./,drasti
cally./,increased./,metabolic./,activity?
A../,Systemic./,reduction./,in./,core./,temperature./,paired./,with./,rapid./,bone./,min
eral./,reabsorption.
B../,Her./,sports./,drink./,replaces./,lost./,sodium./,and./,water,./,her./,body./,produces.
/,more./,angiotensin./,II./,to./,constrict./,blood./,vessels,./,and./,her./,kidneys./,reabso


rb./,more./,water./,and./,sodium./,in./,response./,to./,ADH./,and./,aldosterone.
C../,Intracellular./,potassium./,levels./,collapse./,completely./,to./,allow./,voluntar
y./,muscle./,relaxation.
D../,Her./,lungs./,decrease./,the./,partial./,pressure./,of./,oxygen./,to./,prevent./,oxidat
ive./,microvascular./,injuries.
�./,CORRECT./,ANSWER:./,B

,�./,RATIONALE:./,During./,prolonged./,physical./,exertion,./,the./,body./,sustain
s./,homeostasis./,through./,synchronized./,behavioral,./,hemodynamic,./,and./,ho
rmonal./,responses../,Sweat-
induced./,losses./,of./,volume./,and./,electrolytes./,are./,balanced./,by./,oral./,replace
ment./,(replacing./,sodium./,and./,water)../,Simultaneously,./,decreased./,renal./,p
erfusion./,activates./,the./,RAAS,./,producing./,angiotensin./,II./,to./,cause./,system
ic./,vasoconstriction./,and./,support./,blood./,pressure../,Concurrently,./,Antidiur
etic./,Hormone./,(ADH)./,and./,aldosterone./,act./,on./,the./,renal./,collecting./,ducts./
,and./,distal./,tubules./,to./,maximize./,water./,and./,sodium./,reabsorption,./,minimi


zing./,urinary./,losses.
2../,Michael's./,acute./,pulmonary./,edema./,leads./,to./,respiratory./,acidosis../,Ho
w./,does./,this./,severe./,shift./,in./,systemic./,pH./,directly./,impact./,his./,basal./,meta
bolic./,panel./,(BMP)./,values?
A../,His./,total./,bicarbonate./,levels./,increase./,instantly./,because./,his./,lungs./,tra
p./,base.
B../,His./,CO2./,level./,is./,increased./,due./,to./,impaired./,alveolar./,clearance,./,and./,
his./,serum./,K+./,is./,elevated./,because./,excess./,extracellular./,H+./,moves./,into./,
cells,./,forcing./,K+./,out./,into./,the./,bloodstream.
C../,His./,sodium./,level./,rises./,sharply./,due./,to./,direct./,aldosterone./,suppression
./,in./,the./,liver.



D../,His./,phosphorus./,level./,drops./,to./,zero./,because./,of./,cell./,membrane./,lysis.
�./,CORRECT./,ANSWER:./,B
�./,RATIONALE:./,In./,pulmonary./,edema,./,fluid./,in./,the./,alveoli./,impairs./,gas
./,exchange,./,causing./,retention./,of./,carbon./,dioxide,./,which./,presents./,on./,a./,B


MP./,as./,an./,increased./,CO2./,level./,(respiratory./,acidosis)../,As./,the./,body./,atte
mpts./,to./,buffer./,the./,high./,extracellular./,hydrogen./,ion./,(H⁺)./,concentration,./,
H⁺./,ions./,move./,inside./,the./,cells../,To./,maintain./,electrical./,neutrality./,across./,

, the./,cell./,membranes,./,potassium./,(K⁺)./,ions./,shift./,out./,of./,the./,cells./,and./,into./
,the./,bloodstream,./,causing./,hyperkalemia.



3../,Which./,underlying./,pathophysiological./,mechanisms./,differentiate./,Typ
e./,I./,diabetes./,from./,Type./,II./,diabetes?
A../,Type./,I./,involves./,peripheral./,receptor./,desensitization;./,Type./,II./,involve
s./,alpha-cell./,destruction.
B../,In./,Type./,I./,diabetes,./,the./,insulin-
producing./,beta./,cells./,are./,destroyed,./,resulting./,in./,an./,absolute./,lack./,of./,ins
ulin;./,in./,Type./,II./,diabetes,./,the./,cells./,develop./,insulin./,resistance./,and./,beco
me./,less./,responsive./,to./,insulin.
C../,Type./,I./,is./,triggered./,purely./,by./,functional./,constipation;./,Type./,II./,is./,cau
sed./,by./,an./,absence./,of./,intrinsic./,factor.
D../,Type./,I./,results./,in./,a./,profound./,decrease./,in./,the./,anion./,gap;./,Type./,II./,halt
s./,all./,glucagon./,synthesis.
�./,CORRECT./,ANSWER:./,B
�./,RATIONALE:./,Type./,I./,diabetes./,is./,an./,autoimmune./,disease./,where./,the./
,insulin-


producing./,beta./,cells./,of./,the./,pancreas./,are./,destroyed,./,causing./,an./,absolute
./,insulin./,deficiency../,Type./,II./,diabetes./,is./,characterized./,by./,peripheral./,ins


ulin./,resistance,./,where./,target./,tissues./,and./,cells./,become./,less./,responsive./,t
o./,insulin./,signaling../,While./,both./,lead./,to./,hyperglycemia,./,their./,underlying
./,cellular./,causes./,are./,distinct.



4../,A./,patient./,presenting./,with./,a./,viral./,illness./,and./,severe./,vomiting./,has./,an./
,elevated./,PCO2./,of./,49./,mm./,Hg,./,a./,blood./,pH./,of./,7.53,./,and./,a./,slow./,respirat


ory./,rate../,What./,exact./,acid-base./,imbalance./,does./,this./,patient./,have?
A../,Uncompensated./,respiratory./,acidosis