GCSE Biology Specification

OCR B J257

Section B5.1: How do substances get into, out of and around our bodies?

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#B5.1.1

describe some of the substances transported into and out of the human body in terms of the requirements of cells, including oxygen, carbon dioxide, water, dissolved food molecules and urea

#B5.1.2

explain how the partially-permeable cell membranes of animal cells are related to diffusion, osmosis and active transport

#B5.1.3

describe the human circulatory system, including its relationships with the gaseous exchange system, the digestive system and the excretory system

#B5.1.4

explain how the structure of the heart is adapted to its function, including cardiac muscle, chambers and valves

#B5.1.5

explain how the structures of arteries, veins and capillaries are adapted to their functions, including differences in the vessel walls and the presence of valves

#B5.1.6

explain how red blood cells and plasma are adapted to their functions in the blood

#B5.1.7

explain the need for exchange surfaces and a transport system in multicellular organisms in terms of surface area:volume ratio

#B5.1.8

calculate surface area:volume ratios