PRACTICE PAPERS

Question 1

Three functions of the myelin sheath

Answer 1

-insulates axon
-saltatory conduction
-increases speed of impulse

Question 2

explain why some Action potentials may look different to others

Answer 2

-different number of sodium/ potassium pumps in neuron membrane
-different number of potassium ion channels
-steeper sodium or potassium ion gradients
-more sodium/ potassium ion channels

Question 3

what is the equation for area of a sphere

Answer 3

4pirsquared

Question 4

which type of diabetes is likely to be improved by stem cells

Answer 4

type 1 cus type one results from a shortage of beta cells (in pancreas). stem cell therapy may increase insulin production.
type 2 diabetes may result in insulin resistance rather than a lack of insulin

Question 5

why is standard deviation better than range

Answer 5

-less affected by outlier/ anomaly
-takes into account every value in the data

Question 6

precautions scientists would have to take to make a valid comparison between blood glucose concs

Answer 6

-blood glucose conc measured using the same method
-blood glucose measured at the same time of day/ after eating
-accounting for the patients medical history/ age/ sex
-correct use of statistical test