Select the MOST CORRECT answer. In a cardiac myocyte, changes inthe permeability of ions can lead to a change in membranepotential. In...

		A conducting cardiac myocyte, the rapid depolarization is causedby the opening of T-type calcium channels.
		A contractile cardiac myocyte, the rapid depolarization iscaused by the opening of L-type calcium channels.
		Both conducting and contracting cardiac myocytes, the influx ofsodium and calcium cause the membrane to depolarize and the effluxof potassium causes repolarization.
		Both a) and b) are correct and c) is incorrect.
		a), b) and c) are all correct.

Select the MOST CORRECT answer. An athlete was attempting toimprove their performance through doping, the act of taking illegaldrugs to increase red blood cell count. Unfortunately, the athleteexperienced a reduction of performance instead. Which of thefollowing best explains this outcome?

		Heart rate and stroke volume were increased and thereforecardiac output was reduced.
		An increase in the viscosity of the blood caused totalperipheral resistance to increase, which reduced blood flow.
		A decrease in mean arterial pressure resulted because of theincrease in total blood volume. Because the bulk blood flow wasequal between both sides of the heart, the stroke volume decreasedover time.
		Both a) and b) are correct and c) is incorrect.
		a), b) and c) are all correct.