A living cell is put into a surrounding of 100% pure water ( most hypotonic !!) – Where would the water go? 2. What would be the problem for the cell? 3. How might the cell solve it? . J. Contractile vacuole Movie. Contractile Vacuole UC Davis. Passive and Active Transport
A living cell is put into a surrounding of 100% pure water (most hypotonic!!) –
Contractile vacuole Movie
Contractile Vacuole UC Davis
Across the Cell Membrane
Transport DOWN the Concentration gradient:
From high to low.
Example: Water , oxygen
2. Facilitated Diffusion
Example: Glucose, Ions
Glucose cannot pass through
Channels by Stolaf
Passive Active Transport!
Glucose Channels open in response to the hormone Insulin
Tutorial: Passive and Active Transport
Comparing In terms of:
3. What’s moving?
Transport UP the Concentration gradient:
From low to high.
1. Pumps(Charged Ions)
2. Endocytosis(Large particles)
3. Exocytosis(Large particles)
Maintain a membrane potential with a more negative ions inside and more positive ions outside.
Transport Animation (password)
Active Transport Animation Tutorial
Pumps - by Stolaf
Na/K pump simple animation
Endocytosis of LDL
Transport Animation (and more!)
Transport of Proteins Inside the Cell: Vesicular Transport
Problem: How do we get a new protein from the center of the cell to the membrane?
Protein Transport - ER and Golgi