Gather, process and analyse information from secondary sources to compare the process of renal dialysis with the function of the kidney

Kidney

Renal Dialysis

Structure

Consists of about 1 mil nephrons which filter the blood

Haemodialysis occurs in hospital. Machine circulates blood through semipermeable filters that remove toxins from blood. Takes 3-4hrs.

Dialysers have three parts: compartment for blood, compartment for dialyse, a semipermeable membrane separating the two.

Function and nitrogenous wastes

Removes urea from blood

Removes urea from blood

Other functions

Maintains body's balance of various salts and releases hormones that regulate vital functions including blood pressure, red blood cell production

Concentrations of desired solutes can be adjusted by modifying the dialysis fluid to maintain natural concentration for healthy food.

How often it occurs

Each day two kidneys excrete about 1/5-2.5 litres of urine

Haemodialysis works more quickly than petrineal dialysis, can be done in short sessions (3-4 times weekly), while petrineal must be done daily.

Filtration and reabsorption

Filters and reabsorbs required materials

Filtration but no reabsorption

	Created by shaycrystal4 about 11 years ago

Biology (MAINTAINING A BALANCE) Note on 3. Plants and animals regulate the concentration of gases, water and waste products of metabolism in, created by shaycrystal4 on 15/11/2013.