Cellular Movement Passive and Active Transport Passive Transport

Passive Transport l Does NOT require ENERGY to move particles into or out of

DIFFUSION l The process in which molecules move from areas of HIGH concentration to

DIFFUSION l Example: Smell of baking cookies from the oven moving through the house.

OSMOSIS l The diffusion of water molecules through a membrane

OSMOSIS l Movement of WATER from a HIGHER concentration to a LOWER concentration l

Let’s Practice… l The concentration of oxygen particles inside a cell is 45 percent

Let’s Practice… l The concentration of water molecules inside a cell is 80 percent

Let’s Practice… l The concentration of hydrogen particles inside a cell is 33 percent

Equilibrium l In all cases, cells want EQUILIBRIUM! Too much (or too little) of

When do the molecules stop moving? EQUILIBRIUM = molecules are evenly distributed

Active Transport l Requires ATP ENERGY to move particles into or out of cell

ENDOCYTOSIS l Cell membrane encloses a vesicle filled with particles and absorbs it, BRINGING

EXOCYTOSIS l Cell membrane encloses a vesicle filled with particles and PUSHES IT OUT

Active Transport Example: l. A person trying to squeeze into an already crowded elevator!

What happens to cells when put in salt water? l This is why you

Water moves out of the cell to try to reach equilibrium. The cell dries

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Cellular Movement Passive and Active Transport

Passive Transport l Does NOT require ENERGY to move particles into or out of a cell l Movement of particles from HIGHER concentration to LOWER concentration l DIFFUSION – movement of particles l OSMOSIS – movement of water

DIFFUSION l The process in which molecules move from areas of HIGH concentration to areas of LOW concentration

DIFFUSION l Example: Smell of baking cookies from the oven moving through the house.

OSMOSIS l The diffusion of water molecules through a membrane

OSMOSIS l Movement of WATER from a HIGHER concentration to a LOWER concentration l Example: Plant taking in water during a rainy day.

Let’s Practice…

Let’s Practice… l The concentration of oxygen particles inside a cell is 45 percent and outside the cell is 30 percent. What will most likely happen?

Let’s Practice… l The concentration of water molecules inside a cell is 80 percent and outside the cell is 25 percent. What will most likely happen?

Let’s Practice… l The concentration of hydrogen particles inside a cell is 33 percent and outside the cell is 62 percent. What will most likely happen?

Equilibrium l In all cases, cells want EQUILIBRIUM! Too much (or too little) of a good thing is BAD for the cell!

When do the molecules stop moving? EQUILIBRIUM = molecules are evenly distributed

Active Transport l Requires ATP ENERGY to move particles into or out of cell l Movement of particles from LOWER concentration to HIGHER concentration l Endocytosis l Exocytosis

ENDOCYTOSIS l Cell membrane encloses a vesicle filled with particles and absorbs it, BRINGING IT INTO the cell

EXOCYTOSIS l Cell membrane encloses a vesicle filled with particles and PUSHES IT OUT of the cell