#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