keeping an non constant internal/external environment
keeping a constant internal environment
keeping a constant external environment
8. what happens is a blind-trial
neither doctors or patients know who is in which group
doctors know who is in which group but patients do not
both the patient and the doctor know whether the patient is given the new drug. these trials are used when the patient cannot affect the outcome of using the drug
9. how does a heart attack occur
coronary arteries carry oxygenated blood to the heart. fat can build up on the artery walls. a blood clot may form on this fat. this may block the artery and stop oxygen getting to the heart. heart cells die and the heart is permanently damaged.
when your heart attacks ;)
10. what happens in a double-blind trial
both the patient and the doctor know whether the patient is given the new drug. these trials are used when the patient cannot affect the outcome of using the drug
neither doctors or patients know who is in which group
doctors know who is in which group but patients do not
11. why are cappilary walls very thin (only one cell thick)
because it doesn't carry a lot of blood
to allow oxygen and food to diffuse into cells and waste to diffuse out of cells
because the blood is at a low pressure
12. what does the thick outer wall of arteries (collagen) do
ensure that there is thick outer walls to protect them from bursting due to high pressure
contract and increase blood pressure
recoil, which allows normal conditions to return after contraction
ensure it is smooth to allow efficient blood flow
13. the right lower chamber pumps blood to the...
heart
lungs
rest of the body
14. when does antimicrobial resistance develop
when it rains chocolate
when random changes (mutations) in genes of bacteria or fungi make new varieties that the antimicrobial cannot kill or inhibit
when random changes (mutations) in genes of brains kill microorganisms
15. what is an open-label trial
both the patient and the doctor know whether the patient is given the new drug. these trials are used when the patient cannot affect the outcome of using the drug
neither doctors or patients know who is in which group
doctors know who is in which group but patients do not
16. what does the blood bring to the heart
oxygen and glucose
waste products and glucose
only oxygen
17. what does the lumen do
contract and increase blood pressure
recoil, which allows normal conditions to return after contraction
ensure it is smooth to allow efficient blood flow
ensure that there is thick outer walls to protect them from bursting due to high pressure
18. what happens in most human trials
humans are raced on an Olympic course
one group takes new drug. the controls (another group) takes a placebo or an existing drug for that illness
a group of people take a new drug
19. what do capillaries do
take blood to and from tissues
take blood to and from the heart to the rest of the body
take blood to and from the heart to the lungs
20. why are the outer walls of veins thinner
because there is more fat surrounding them
because blood is at a lower pressure
because there is less blood being pumped from th right lower chamber
