(a)[1]
State the name of the cell type that carries electrical impulses to the heart.
(b(i))[3]
Fill in Table 3.1 with the terms ‘open’ and ‘closed’.
(b(ii))[1]
State the function of the heart valves.
(c(i))[2]
Calculate the heart rate, in beats per minute, before exercise begins. Show your working and round your answer to the nearest whole number.
(c(ii))[3]
Using Fig. 3.2, describe how the heart's electrical activity during exercise differs from the electrical activity before exercise begins.
(c(iii))[2]
Describe how ventilation of the lungs changes while the athlete exercises.