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Why urea can't cross membranes?
Passive diffusion - Urea has its own concentration gradient so it will go from an area of high concentration through the cell membrane into an area of lower concentration.
Outline the route taken by the urea after extraction from the blood until it leaves the body?
Urea is formed in the kidneys, where it is excreted through the collecting ducts into the ureters and then stored in the urinary bladder until it is voided through the urethra.
Is carpet urea same as nitrogen urea?
No,carpet urea is urea formaldehyde it is aproduced by treating urea with formaldehyde
Which process reduces the concentration of urea in the blood of humans?
The term 'urea' is actually the body's way of eliminating Ammonia wastes from cells metabolism. In the blood the urea is a waste product which is eventually excreted through the glomeruli in the kidneys and eventually leaves the body via urine. The process is called Glomerular Filtration. Also there is a lesser amount of urea excreted in sweat.
How the amount of urea present in urine is controlled and what are effects of excess of urea in human body?
Well... the amount of Urea is controlled mainly by the kidneys and through a long process involving the liver, heart, lungs, and brain and many, many enzymes which in the end controls the amount of Urea. Excess Urea in the blood can cause poor oxygen transfer into tissues and eventually lead to death. Excess Urea in the Bladder can lead to forced urination, or in lamest terms, peeing yourself, or a bladder or Urinary Tract infection
Why did Nacl pass through the 50 MWCO and not urea?
Because Na has MW of ~23 and Cl has MW of ~35...both of which are small enough to pass through a molecular weight cut off (MWCO) of 50 (don't add there molecular weights together). urea has ~ MW of 60 so it's too big to cross membrane.
What was the average diffusion rate of urea when the 200 MWCO membrane was used as a barrier?
Once diffusion occurs it does not matter the MWCO of the membrane, but it depends on difference of concentration, as it is said in Fick's first law.
Which solutes diffuse from patient's blood during dialysis?
urea
What are tubes inside the kidneys where urea and water diffuse from the blood?
nephrons
Why does nacl and urea and glucose diffuse?
nacl diffuse in plasma membrane because there are protein channels that allows certain ions to diffuse around the membrane, like sodium and chloride ions, please note that these channel proteins are selectively permeable meaning sodium channels only allow sodium to enter the cell and so on... urea diffuses into the pm the same way through facilitated diffusion of certain protein channels glucose diffuse into the pm as a part of secondary active transport, which means it uses ATP indirectly. it diffuses in the process called symport
Why urea can't cross membranes?
Passive diffusion - Urea has its own concentration gradient so it will go from an area of high concentration through the cell membrane into an area of lower concentration.
What solutes typically diffuse from the patients blood during dialysis?
urea, uric acid, nacl, creatinine, phosphates
What do they mean by MWCO in dialysis tubing?
First of all, the filtration in dialysis doesn't happen in the tubing. Rather it happens in an artificial kidney called the dialyzer. It's essentially a dense bundle of thousands of fibers which make up the filter itself. The fibers allow the blood to pass through the dialyzer and the potassium and bicarbonate solution used to mix with the blood crosses over the fibers, cleaning the blood via filtration. MWCO (molecular weight cut off) in dialysis simply means the amount of molecules that are allowed to pass through the membranes. Proteins are too big to pass by design as we don't want to "wash away" the good stuff. Wastes like urea, nitrogen etc are allowed to pass through and out of the blood before the blood returns to the patient. Generally, the bigger the patient, the more filtration is required, so the higher the MWCO is. Hope this helps!
Where is urea removed from the body?
By filtration through the kidney.
Where is urea removed from after it has passed through the blood?
The Kidneys, where the blood/urea thing takes place.
What part of our bodies acts like a visking tube?
You may be thinking of the blood capillaries. Like visking tubing, their walls are able to let substances diffuse in and out. This is also true of the cell membranes. However both of these are much more permeable than visking tubing. The kidney contains semi-permeable membranes which allow urea to pass through but not other substances such as proteins.
How does the urea enters the urinary system?
through the blood
