1. Passive and Active Transport
Cell Membranes
Passive and Active Transport

2. Vocabulary ( Passive transport)
Passive Transport-The movement of materials across the cell membrane without using cellular energy. Concentration Gradient- region along which the density of a chemical substance increases or decreases. Diffusion- particles move from an area of high concentration to an area of low concentration. Osmosis- Water crossing a selectively permeable membrane. Hypotonic-Below strength ( solute) Hypertonic-Above strength ( solute) Isotonic-Same strength ( solute) Aquaporin- Channel proteins that allow water to pass through cell membranes

3. Vocabulary Passive Transport Diffusion Facilitated Diffusion Osmosis
Aquaporin
Isotonic
Hypertonic
Hypotonic

4. Visual (press word link for video)
DIFFUSION

5. Facilitated Diffusion
Protein Channel Activity
The net movement is DOWN the concentration gradient. ( PASSIVE)

6. Facilitated Diffusion
Still no energy on the part of the cell!
One example is aquaporins, which allow water to transport over the cell membrane. Knowing what you know about the structure of the membrane, why might water have a hard time with direct crossing?

7. Facilitated Diffusion
Osmosis Osmosis Activity

8. Vocabulary ( Active Transport)
Active Transport- Against the concentration gradient, requires energy from the cell.
Protein Pump
Endocytosis
Exocytosis

9. Active transport
Pumping a solute across a membrane against its gradient requires work. Cells expend energy most often in the form of ATP.
Active Transport

10. Bulk Transport
Vesicles are “packaged” in the Golgi, and sent off for shipping.
Endo and Exocytosis
But just how
do you think the vesicles get to the membrane?
Motor Proteins! ( you aren't required to know this, but this is just awesome )
[5:30-6:35]

11. Bioflix and Assessment Passive, Active, and Endocytosis and Exocytosis
[Recap] BIOFLIX AND QUIZ