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  • OCR A Level Biology- Heart
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OCR A level Biology- Heart

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2024/2025 Written for academic year
Institution OCR A Level Biology- Heart
Course OCR A level Biology- Heart
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Aorta Heart to body Vena cava Body to heart Pulmonary vein Lungs to heart Pulmonary artery Heart to lungs Atrioventricular valve Valve atria to ventricles Semilunar valve Valve ventricles to arterys Diastole Relaxed atria and ventricles Ventricular systole Contraction of ventricles

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OCR A level Biology- Heart

Aorta ✔✔Heart to body



Vena cava ✔✔Body to heart



Pulmonary vein ✔✔Lungs to heart



Pulmonary artery ✔✔Heart to lungs



Atrioventricular valve ✔✔Valve atria to ventricles



Semilunar valve ✔✔Valve ventricles to arterys



Diastole ✔✔Relaxed atria and ventricles



Ventricular systole ✔✔Contraction of ventricles



Atrial systole ✔✔Contraction of atrium



Sinoatrial node (SAN) ✔✔Wave of excitation actors atria causing them to contract



Atrioventricular node (AV) ✔✔Wave of excitation along purkyne (in septum)tissue to apex causing
ventricles to contact



Apex ✔✔Bottom of heart



Myogenic ✔✔Cells conduct electricity and initiate own contraction

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