BRS PHYSIOLOGY EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED
0 view 0 purchase
Course
BRS PHYSIOLOGY
Institution
BRS PHYSIOLOGY
BRS PHYSIOLOGY EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED
Total body water
60% of body weight is due to water
Total body water composition
1. ICF=2/3 of body water. K, Mg, Protein, organic phosphate
2. ECF=1/3 of body water. Interstitial fluid (3/4 of ECF, little protein) and plasma (1/4 ...
1. Osmolarity of ECF increases bc osmoses of NaCL added.
2. Water therefore shifts from ICF to ECF (to dilute it for equilibrium). This increases the
osmolarity of the ICF and decreases the ECF osmolarity
3. As a result of the shift out of cells, ECF volume increases and ICF volume decreases.
4. Protein conc and HCT decrease because of the increase in ECF volume.
5. BP increases bc ECF increases
Sweating in a desert=loss of water (AKA hyper-osmotic volume contraction)
1. Osmolarity of ECF increases because sweat is hyposmotic (therefore mostly water,
not salt is lost)
2. ECF volume decreases because water is lost.
3. Water shifts from ICF to ECF and therefore ICF osmolarity increases and ICF volume
decreases.
4. Plasma protein increases because of the decrease in ECF
5. HCT is unchanged bc water shifts out of RBCs dec their voluming.
, Syndrome of inappropriate antidiuretic hormone (SIADH)=gain of water
(hyposmotic volume expansion)
1. Excess water is retained therefore ECF osmolarity decreases
2. ECF volume increases. Water then shifts into cells therefore ICF osmolarity
decreases and ICF volume increases.
3. Plasma protein conc decreases bc of the increase in ECF volume
4. HCT is unchanged bc water into RBC inc their volume
Adrenocortical insufficiency
1. Osmolarity of ECF decreases. Lack of aldosterone then decreases NaCl reabsorption
and more is excreted than reabsorbed so losing it.
2. ECF volume dec bc water shifts into cells since ECF is hyposmotic.
3. ICF osmolarity decreases and its volume inc due to the shift into cells.
4. HCT increases bc dec ECF volume and RBCs swell bc of water entry into cells
5. APB decreases due to the dec in ECF volume (plasma and interstitial)
Summary of shifts
Y=osmolarity
X=volume
-First 2 on left are iso-osmotic therefore no shift between ICF and ECF (ICF stays the
same)
-Middle are hyper osmotic (high Y) therefore shifts from ICF to ECF (Low ICF)
-Right are hypo osmotic (low Y) therefore shifts from the ECF to the ICF
Renal clearance
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller AcademicSuperScores. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
