1. Cell Transport

2. WHAT IS Homeostasis?
Cells try to maintain a relatively constant internal environment.
This is known as HOMEOSTASIS

3. Things our Body RegulatespH
TEMPERATURE
BLOOD GLUCOSE
WATER ( in cells and tissues)
Blood pH between
37 C ( 98.6F)
Up to 100mg/dL

4. Types of Cell transport- HOW THINGS MOVE
Diffusion – movement of molecules from an area of HIGH concentration to an area of LOW concentration.

5. The semipermeable membrane…
Our cell membrane and other substances are SELECTIVELY or SEMI PERMEABLE
The will let some things in and not others. Some are small enough to squeeze through holes or small PORES
Some substances will need HELP to cross the membrane.

6. Diffusion with help…
Facilitated diffusion involves the use of a transport protein to get the molecules to move from an area of HIGH concentration to an area of LOW concentration.

7. OSMOSIS – Diffusion of Water
WATER moves from an area where there are LOTS of water molecules to an area where that are FEW water molecules.

8. The RESULT of water movement

9. Things to help you understand OSMOSIS
SALT “SUCKS” – the more salt the more the water will be SUCKED across
WATER IS MOVING- It moves from LOTS of free water to an area with less free water

10. Active vs Passive Transport
No ATP
HAPPENS SPONTANEOUSLY
DOWN THE CONCENTRATION GRADIENT
Diffusion, osmosis and Facilitated diffusion are all types
ACTIVE
ATP is NEEDED
HAPPENS WITH ENERGY
UPHILL, UP THE CONCENTRATION GRADIENT
Endocytosis, pinocytosis, phagocytosis, exocyotosis are all types

11. ACTIVE TRANSPORT
This needs ENERGY in the form of ATP to occur. This moves things from an area were there are very few of that kind of molecule to where there are LOTS.

12. The SODIUM POTASSIUM PUMP
ACTIVE TRANSPORT REQUIRES ENERGY
The SODIUM POTASSIUM PUMP