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Question 1

some people who take beta blockers get out of breath when they exercise [ao3]. suggest why they can have this effect.

Answer 1

when we exercise, we respire more and release more energy therefore we need more oxygen.

beta blockers reduce heart rate during exercise. they reduce stroke volume therefore it reduces cardiac output and therefore the heart cannot supply oxygen fast enough.

therefore, the breathing rate increases to increase the rate of oxygen absorbed and remove the co2 from the body. however, the increased breathing rate cannot keep up with the changes in the heart function.

so those who take beta blockers get out of breath when they exercise because it lowers the heart rate

Question 2

explain how a student could modify their investigation to determine the concentration of the solution inside each [egg]

Answer 2

use five or more different concentrations of salt/sugar solutions in the beakers. plot the percentage change (mass/volume) on a graph. plot a line of best fit and find the concentration of the egg by looking at 0% change.