Chapter 4: Cell Membrane Structure and Function
Chapter 4: Membrane Structure and Function Types of Movement Across Membranes: 1) Passive Transport • Requires no energy • Substances move down concentration gradients A) Simple Diffusion • Small molecules pass directly through the phospholipid by-layer (e.g. CO 2, H 2O, O 2) (Figure 4.3a) Rate depends on: 1) Molecule size 2 ...
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