Cell Transport Unit 4.

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Presentation transcript:

Cell Transport Unit 4

What is a cell again? Remember, a cell is the basic unit of life!

How do cells get nutrients and get rid of waste? Cell transport describes processes that occur across the cell membrane This is the cell membrane (lipid bilayer) Lipids

What do I need to know before we start? Concentration- refers to the amount of solute in solvent More solute = Higher concentration Less solute = Lower concentration High Concentration * * * * * * * * * * * * * * * * * * * * * * Low Concentration.

If the process does not require energy… Processes that do not require energy (ATP) are called passive transport

Osmosis Osmosis is a passive transport process. Water molecules move from an area of high concentration to low concentration through lipid area of cell membrane

Hypertonic Solution More Solute Less Solute H20 H20

Hypotonic Solution Less Solute More Solute H20 H20

Isotonic Solution Equal solute Equal Solute H20 H20

Osmosis Practice Cell 7-3

Osmosis Practice Cell 7-3

Osmosis Practice Cell 7-3

Diffusion Diffusion is a passive transport process. Particles move from an area of high concentration to low concentration through lipid area of cell membrane

Facilitated Diffusion Facilitated Diffusion is a passive transport process. Particles move from an area of high concentration to low concentration through protein channel area of cell membrane

If the process does require energy… Processes that require energy (ATP) are called active transport Recall: Which organelle gives the cell energy? Particles move against the concentration gradient (low to high)

Comparing Transport Processes

Cell Membrane and the body Remember homeostasis? The plasma membrane helps keep the cell in balance which keeps your body in balance