A comprehensive GCSE Biology Organisation revision booklet covering the key concepts students need to understand for exams. Topics include the digestive system, enzymes, digestive enzymes, gas ...
GCSE Biology worksheet on the heart with answers, covering the function of the heart, major blood vessels, oxygenated and deoxygenated blood, artery and vein structure, the left ventricle and double ...
Red blood cell Carry oxygen Biconcave shape - provides a large surface area for the diffusion of oxygen. No nucleus - provides more space for haemoglobin. Haemoglobin – contains iron and carries ...
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