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polarity
asymmetry, different surfaces with different functions/ organelles
Basal surface
side adjacent to basement membrane
Apical surface
facing the lumen
Lateral surface
side surfaces
Microvilli
• Plasma membrane extensions
• Increase surface area
• Absorption/ Exchange of materials
• Ex: Brush border of small intestine
Cilia
• Primary cilium: non-motile, sensory organs
• Motile cilia: motile, respiratory tract, fallopian tubes
• Shorter axoneme
• Dynein – motor protein
• Ex: lining respiratory tract
Flagella
• Long axoneme
• Propels sperm cell
tight junction
sealant
desmosomes
resist stress
gap junction
communication