Functions of the Kidney, Renal physiology

This article is to discuss the renal physiology, describing the functions of the kidney as a whole, then illustrating the function of each part of the nephron, which is the functional unit of the kidney.

This article is to discuss the renal physiology, describing the functions of the kidney as a whole, then illustrating the function of each part of the nephron, which is the functional unit of the kidney.
Functions of the kidney :
1- Excretory   : excretion of waste products and drugs.
2- Regulatory  : control of body fluids volume & composition.
3- Endocrinal  : production of erythropoietin, renin & P.G.
4- Metabolic   : metabolism of vitamin D.

Endocrine functions of the kidney :

- Renin-angiotensin system.
- Production of PG & erythropoietin.
- It is a site of action of ANP and parathormone.
- Vitamin D metabolism.

Function of the kidney tubules:

1- Proximal Convuluted tubules (P.C.T)
- Reabsorption of 65% of Na and most K and Ca.
- Reabsorption of all HCO3.
- Reabsorption of 65% of water (obligatory water reabsorption).
- Reabsorption of all A.A and glucose.

2- Loop of Henle
- Reabsorption of Na, CI, Ca, K in ascending limb and reabsorption of H2O in descending limb.
- It increases the medullary tonicity which is important in the process of urine concentration in collecting tubule as follows :
• Na outflow from ascending limb ===> ++ Na in medulla ===> ++ medullary tonicity.
• ADH ===> open H2O channels of collecting tubules through cAMP ===> This will subject the fluid in the collecting tubules to the high medullary tonicity ===> H2O reabsorption ===> urine concentration.

3- Distal Convuluted Tubules DCT
- Na reabsorption & k excretion through aldosterone.
- Also there is reabsorption of H2O and Ca.
- Secretion of H+ and ammonia.
4- Collecting tubules
- Concentration of urine as above.
- The amount of reabsorbed water is variable (facultative water reabsorption) depending on the blood level of ADH.

COMMENTS

BLOGGER
Name

andrology,2,Cardiology,10,Differential-diagnosis,5,E.N.T,32,General Surgery,4,General-Health,6,GIT,19,Gynecology,1,Hepatology,8,Internal-medicine,1,Microbiology,3,Orthopedics,1,Psychiatry,3,Respiratory-diseases,59,Rheumatology,50,STDs,3,Symptomatology,9,Urology,36,
ltr
item
Med2Date: Functions of the Kidney, Renal physiology
Functions of the Kidney, Renal physiology
This article is to discuss the renal physiology, describing the functions of the kidney as a whole, then illustrating the function of each part of the nephron, which is the functional unit of the kidney.
Med2Date
http://www.med2date.com/2013/08/kidney-functions.html
http://www.med2date.com/
http://www.med2date.com/
http://www.med2date.com/2013/08/kidney-functions.html
true
1129835733813637495
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy