Chapter 7 – Cell Structure & Function

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Presentation transcript:

Chapter 7 – Cell Structure & Function Section 7.3 – Cell Boundaries

Movement through cell boundaries: Diffusion: The movement of molecules from high to low concentration.

Osmosis: The diffusion of WATER through a selectively permeable membrane

Facilitated Diffusion: Use of a protein channel to cross through a cell membrane

Active Transport: Sometimes materials need to move in opposite concentration gradients (low to high) Requires energy Endocytosis (into cell) Phagocytosis (takes food in) Pinocytosis (takes water in) Exocytosis (out of cell)

Active Transport: Notice the energy (ATP) required to move molecules AGAINST the gradient!! (low to high)

Concentration Levels Isotonic Solution: Equilibrium Water will move both in and out Cell will not change shape

Hypertonic Solution: (Above strength) Solution has a higher solute concentration than the cell. Water will move out of cell Cell will shrink Hypotonic Solution: (Below strength) Solution has a lower solute concentration than the cell. Water will move into the cell Cell will swell