Leah.J
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I don't understand how any substance can pass through the cell membrane without the help of proteins.
My book says that O2 and CO2 are both non polar substances which can easily pass through the hydrophobic bilayer, but don't they have to pass first through the hydrophilic phosphate heads ?
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Leah.J
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Lani_5678
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Only non polar substances can pass through due to the fact that the space within the lipid bilayer is hydrophobic so no polar molecule would be able to come through and interact with the membrane. so substances such as O2 can move freely via diffusion into the cell
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