Role of Kidney and Homeostatis (NEW) Flashcards
What is the function of the Kidney?
to regulate the water content of the blood and remove waste products from the blood
Why is it important for the kidney to regulate water levels?
your body cells would not function efficiently and cells would swell
Why is important for the kidney remove urea from our blood?
As too much urea is toxic
What substances get reabsorbed into the blood as the filtrate moves into the FIRST COILED TUBULE?
glucose, some water and salts
What fluids remain in the nephron after SELECTIVE reabsorption?
- urea
- water
- salts
What is the process of Ultrafiltration?
- Blood flows into the capillary knot
- the blood vessels entering the capillary knot narrow
- the high pressure causes the small molecules urea, glucose and salts and water to be forced from the capillary knot into the bowman’s capsule
How can you tell if you have kidney disease?
Blood or cells present in the urine
How can you tell you have diabetes from urine?
The presence of glucose in urine
Where does urine go from the kidney?
Travels through the ureter to the bladder where it is stored before being passed out of the body from the urethra
What does ADH do to your body on a hot day?
- Brain monitors water levels
- Water level in blood is low
- ADH is released (into the blood)
- More ADH means more reabsorption into kidney
- more water goes back into blood
- so the volume of urine is less and more concentrated
- negative feedback
What does ADH do to your body when there is too much water?
- The brain detects the water content of the blood is too high.
- Blood water level is too high
- Less ADH is released (INTO THE BLOOD)
- Less ADH means LESS reabsorption into the kidney
- A large volume of dilute urine is released
- Examples of NEGATIVE FEEDBACK
How can you treat kidney failure?
Kidney dialysis
What is dialysis?
blood is removed from the body and flows through tubing made from a selectively permeable membrane
Why does a dialysis machine need ideal concentrations of dissolved substances?
- contains equal concentration of glucose and salts that should not be removed from the blood (no net diffusion)
- It contains no urea and so urea will diffuse from a high concentration in the blood out into the dialysis fluid which is then disposed of
Why do dialysis and blood need to flow counter current each other?
to maintain a concentration gradient for diffusion of urea across the whole membrane
