(a(i))[1]
Explain what the term double circulation means.
(a(ii))[3]
Fig. 3.1 is a photograph of one valve in the mammalian heart. Identify the structures labelled A in Fig. 3.1 and describe their function during the cardiac cycle.
(b(i))[2]
With reference to Table 3.1, explain why using gentamicin and penicillin G together lowers the risk of antibiotic resistance developing when treating endocarditis.
(b(ii))[3]
Describe how the bacteria that cause endocarditis could become resistant to gentamicin.