Edexcel OLevel Biology revision notes

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Lesson

Lesson- 2.7.15- describe the structure of the heart and how it functions.

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Lesson-2.7.14- understand how platelets are involved in blood clotting, which prevents blood loss and the entry of micro-organisms.Previous Lesson-2.7.16- explain how the heart rate changes during exercise and under the influence of adrenaline.Next