Nitrogen Metabolism (MCBM Exam 3)
Questions and Answers (Graded A)
Intestinal enzymes come from the ______ - ANSWER - pancreas
Nitrogen primarily comes from ______ - ANSWER - protein
N balance - ANSWER - -when nitrogen intake = loss
-in healthy adults
(+) N balance - ANSWER - -when nitrogen intake > nitrogen loss
-occurs in growing children, pregnant women, illness/trauma recovery
(-) N balance - ANSWER - -when nitrogen loss > nitrogen intake
-due to starvation
_______ is a disease due to (-) N balance - ANSWER - Kwashiorkor
-when loss > intake
___ % of nitrogen excretion is through urea - ANSWER - 86%
Ureotelic things - ANSWER - excrete urea
-occurs in terrestrial animals (us)
Ammonotelic things - ANSWER - excrete ammonia directly
-occurs in bony fish
Urea Cycle Step 2: - ANSWER - -Carbamoyl phosphate condenses with Ornithine to make
Citruline via ORNITHINE TRANSCARBAMOYLASE
, -occurs in mitochondrial matrix
Urea Cycle Step 3: - ANSWER - -Citruline condenses with Aspartate to make Argininosuccinate
via argininosuccinate synthase
-occurs in cytosol
Urea Cycle Step 4: - ANSWER - -Argininosuccinate ---> Arginine via argininosuccinate lyase
-occurs in cytosol
Urea Cycle Step 5: - ANSWER - -Arginine is converted into Urea via enzyme argininase
-this step regenerates Ornithine
Uricotelic things - ANSWER - excrete uric acid
-occurs in birds & reptiles
what are the 3 stomach digestion cells? - ANSWER - mucosal, parietal, chief
Mucosal cells of the stomach produce ___ and _____ - ANSWER - gastrin and histamine
Parietal cells of the stomach produce _____ - ANSWER - HCl
Chief cells of the stomach make ______ - ANSWER - pepsinogen
the stomach secreting all these things is initiated by ____ - ANSWER - ACh (acetylcholine)
What is the end result of digestion in the stomach? - ANSWER - liquid chyme
the intestinal mucosa produces 2 hormones which are ____ and ____, and 1 enzyme which is
____ - ANSWER - 2 hormones: cholecystokinin and secretin
1 enzyme: enteropeptidase
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 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 NursingTutor1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £8.93. You're not tied to anything after your purchase.
