Download How a Cell Functions

How a Cell Functions
Main Idea
Supporting Information
1. How materials move in and
out of the cell.
2. Selective Permeability
3. Materials can move in and out of the cell through
the cell’s membrane.
3. Selective means that the cell membrane can
“select” what goes in and out of the cell.
1. Movement of materials in
and out of the cell.
2. Passive Transport
3. Materials move from a crowded place to a less
crowded place.
4. No energy is required.
3. Diffusion
4. Movement from an area of high concentration
to an area of low concentration.
3. Osmosis
4. Movement of water across the cell membrane.
5. Movement of water from an area of high
concentration to an area of low
concentration.
4. Examples
5. Cell 40% water placed in solution 65%
water. Which way does water move?
6. Into cell – more water outside cell than
inside cell.
5. Cell 88% water placed in solution 85%
water. Which way does water move?
6. Out of cell – more water inside cell than
outside cell.
5. Cell 90% water placed in solution 90%
water. Which way does water move?
6. No movement. Both sides are equal.
Many of life's failures are experienced by people who did not
realize how close they were to success when they gave up.
-Thomas Edison
Main Idea
Supporting Information
1. Movement of materials in
and out of the cell.
2. Active Transport
3. Materials move from a less place to a more
crowded place.
4. Energy is required.
3. Molecules are “carried” into or out of the cell
using the cell’s energy.
1. Waste Removal
2. Cell processes produce carbon dioxide (CO2), which
the cell cannot use.
3. Moves out of the cell and into the blood (selective
permeability).
3. The CO2 passes out of the blood cells (selective
permeability) and into the lungs.
3. You exhale and get rid of the CO2.
2. Lysosomes
3. Collects wastes and passes them through the cell
membrane.
4. Waste products pass into the blood and are
filtered by the kidneys.
4. Waste products enter the bladder and you have
to go to the bathroom.
1. Cellular Respiration
2. The process a cell uses to make energy.
2. Four steps.
3. Step 1 – Glycolysis
4. Process starts with a glucose molecule
4. When finished, produces 2 molecules of ATP
5. ATP – Adenosine Triphosphate – molecule used by
body to function.
3. Step 2 – Transition Reaction
4. Further breaks down molecules from Glycolysis.
4. Two molecules of CO2 are produced.
3. Step 3 – Krebs Cycle
4. Finishes processing molecules.
4. End product – 4 ATP & 4 CO2.
3. Step 4 – Electron Transport Chain
4. Produces 32 ATP (body needs 38 ATP to
function properly.
4. Gets rid of excess hydrogen molecules by combing
with oxygen molecules outside mitochondria. (This is
why we need oxygen. Without oxygen, cellular
respiration stops and Step 2 and you die because you
have too little ATP.)