Studies of the ionic basis of the action potential in squid giant axon found that a. decreasing potassium outside the cell increases the size of the action potential. b. decreasing sodium outside the cell increases the size of the action potential. c. decreasing potassium outside the cell decreases the size of the action potential. d. manipulating sodium has large effects on both the size of the action potential and the resting membrane potential. e. decreasing sodium outside the cell decreases the size of the action potential.

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed