Stuff I forget Flashcards
What are 3 differences between mammals and birds?
-birds have feathers, wings and 2 legs
Where would you find stem cells in the plant?
meristem (tips of roots and shoots)
What part of the neurone is long and what insulates it?
- axon
- insulated by myelin sheath
What is meant by ‘hormone’?
-chemical messengers carried by blood
Why is it important that homeostasis is maintained?
metabolism only operates in a narrow range of temperatures and pH and also needs nutrients and water in the correct amounts
What is negative feedback?
any change in from INTERNAL OPTIMAL conditions, causes the body to compensate by causing an opposing change
What sort of tissue is the Iris?
It is a muscle
Do light waves continue in the same direction in the light?
no, the cornea refracts the light
What happens if PROTEIN is present in the urine?
problems with ULTRAFILTRATION
What gland releases ADH?
pituitary gland
What does the collecting duct do?
- carries urine to the ureter
- some water is selectively reabsorbed here
What does benedict’s test do?
Test for glucose
Why does the tubule have a rich blood supply?
As SELECTIVE REABSORPTION happens here
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
What immunoussay?
- diagnosis of diseases such as HIV, Chlamydia and Malaria
- using radioactive labels of fluorescent dyes ATTATCHED to monoclonal antibodies to attach to specific antigens
How could you tell how EXTENSIVE a malaria infection was?
-use monoclonal antibodies to detect plasmodium
What organ produces Lymphocytes B that make antibodies?
The spleen