Molecular filtering -epithelial cells require a basement membrane as a structural support. in most epithelia the basement membrane prevents penetration from the underlying lamina propria into the epithelium. basement membranes are a pathway for migrating cells during development and repair processes (e.g., healing of skin wounds). in the kidney, the basement membrane of the renal glomerulus forms a selective barrier for the filtration of the plasma. active ion transport and modification of secretory proteins are characteristics of the epithelia that are positioned on the basement membrane, not of the basement membrane itself. contractility and excitability are characteristics that are not associated with basement membranes.
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