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Intro to Cells, Organelles, and Osmosis
Transcript of Intro to Cells, Organelles, and Osmosis
the diffusion of water through a selectively
permeable membrane (like in a cell)
If the water concentration of the cell’s cytoplasm is lower then that surrounding the cell then osmosis will result in the cell gaining water
Effects of Osmosis on a Cell...
The cell can burst !!!
If the water concentration inside the cell is higher than the outside the number of water molecules diffusing out will be more than that entering and the cell will shrink and shrivel
The water concentration inside the cell is the same as the outside, the cell stays the same size
If a person drinks too much water too quickly, the kidneys can't flush it out fast enough
What happens if we drink too much water ?
Who drinks this much water ?
On a dare
Coming down off certain drugs
Cells swell up (not a huge problem for fat or muscle cells)
Brain cells are tightly packed in the skull with little room to expand
Brain swelling (edema) can cause seizures, coma, and death
The salinity of seawater is 4 times greater than our bodies
What if we drink salt water ?
Kidneys try to flush out the seawater by urinating
The body would get rid of more water than it takes in
This results in dehydration, nausea, weakness, eventually organ failure, and death
What about plants ?
Plants have cell walls
The cell walls keep plant cells from bursting
Plant cells rely on turgor pressure to prevent wilting
Weigh each celery stalk before and and after we place it in water and salt water solutions.
Weigh and measure the circumference of each egg before you put it in Water, Vinegar, and corn syrup
Using the Plant Parts Make at least 5 microscope slides with your partner.
Be sure to label each slide and write or draw your observations of the plant cells.
Eggs in Vinegar
This is often used to demonstrate
osmosis, BUT it's really a chemical reaction
2CH3COOH + CaCO3
H2O + CO2 + Ca(CH300)
vinegar + Calcium react to form
Water + Carbon dioxide + Calcium acetate
How do camels store water ?
You will be given the name of an organelle. Prepare a presentation which answers the following questions :
1. In what type of cell is your organelle found ? (5)
2. What is the organelle's composition or structure ? (5)
3. What is its function ? (5)
4. How is the organelle's function connected to other parts of the cell and the entire cell ? (5)
5. Draw or make a model of your organelle. (10)
This can be done on a PowerPoint or Prezi.
ORGANELLES - Parts of the cell that have specific roles to play in how cells work just like organs help the body to function properly as a whole.
Some organelles are separated from the rest of the cell by lipid bi-layers similar in structure to the cell membrane.
What are some differences
between animal and plant cells ?