Movement Across Membranes (1.3)

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Presentation transcript:

Movement Across Membranes (1.3) Pre – AP Biology Movement Across Membranes (1.3)

Movement across the membrane Gases go through a wet phospholipid bi-layer. Ions & water go through proteins

Diffusion High concentration  low concentration

Osmosis Water moves Hypo  Hyper

Water movement and cells

Water Potential (Ψ) High potential  low potential

Facilitated diffusion See the use of protein help?

Active Transport using a Na/K pump See the use of ATP(energy molecule)?

Proton pump needing ATP low concentration  high concentration

Exocytosis

Endocytosis Phagocytosis & Pinocytosis