biology B3 revision!

SHAPE : doughtnut shape to give a large surface area for absorbing oxygen

       dont hae a nucleus - allows more room for oxygen

       contains haemoglobin which combines with oxygen to be oxyhaemoglobin

JOB : carries oxygen from lungs to all cells in the body

IT CARRIES EVERYTHING IN THE BLOOD

RED AND WHITE BLOOD CELLS AND PLATELTS

NUTRIENTS LIKE GLUCOSE AND AMINO ACIDS - FROM THE GUT TO THE CELLS

CARBON DIOXIDE FROM ORGANS TO LUNGS

UREA FROM LIVER TO KIDNEYS

HORMONES

ANTIBODIES AND ANTIGENS

DIALYSIS MACHINES FILTER THE BLOOD

IN A DIALYSIS MACHINE THE PERSONS BLOOD FLOWS THROUGH A SELECTIVELY PERMEABLE MEMBRANE SURROUNDED BY DIALYSIS FLUID.

ALLOWS PERMEABLE THINGS THROUGH LIKE IONS AND WASTE SUBSTANCES BUT NOT BIG MOLECULES LIKE proteins

DIALYSIS FLUID HAS SAME CONCENTRATION OF DISSOLVED IONS AND GLUCOSE AS HEALTHY BLOOD SO THEY WONT GET LOST FROM THE BLOOD

ONLY WASTE SUBSTANCES AND EXCESS IONS AND WATER DIFFUSE ACROSS THE BARRRIER

IT IS THE ONLY CURE AT THE MOMENT

CAN BE REJECTED BY THE BODYS IMMUNE SYSTEM, SO TO PREVENT THIS HAPPENING PRECAUTIONS ARE MADE 

• DONOR  WITH TISSUE SAME TYPE THE PATIENT
• PATIENTS BONE MARROW ZAPPED WITH RADIATION TO STOPWHITE BLOOD CELLS FROM BEING PRODUCED - MEANS YOUR NOT PROTECTED FROM OTHER DISEASES
• HOWEVER IT DOES MEAN THAT THE PATIENT DOES NOT HAVE TO BE ON A STRICT DIET AND DO REGUALR DIALYSING

yay :)