**Mindmap to cover the heart and cardiac cycle for the OCR A Level Biology specification. Covering spec points 3.1.2 e-h.
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(e) the external and internal structure of the mammalian heart.
(f) the cardiac cycle. To include the role of the valves and the pressure changes occurring in the heart and associated vessels.
(g) how heart action is initiated and coordinated. To include the roles of the sino-atrial node (SAN), atrio-ventricular node (AVN), purkyne tissue and the myogenic nature of cardiac muscle (no detail of hormonal and nervous control is required at AS level).
(h) the use and interpretation of electrocardiogram (ECG) traces. Including a normal heart only.
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