How does membrane permeability influence the effectiveness of cell signaling molecules like hormones?
Instructor solution
Membrane permeability influences the effectiveness of cell signaling molecules like hormones by determining how easily these molecules can enter or exit the cell. For lipid-soluble hormones, high membrane permeability allows them to diffuse directly through the lipid bilayer and bind to intracellular receptors. For water-soluble hormones, membrane permeability affects the availability of receptor sites on the cell surface and the subsequent activation of secondary messenger pathways.
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