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Diffusion and cells - biology
- Diffusion
- What is diffusion?
- Diffusion is the net movement of a gas or a solute from and area of high concentration to an area of low concentration as a result of the random movement of particles
Annotations:
- Dictionary Net movement - Overall movement
- Large molecules cannot usually move through a membrane because they are too big but smaller particles will eventually even themselves out throughout a molecule.
- Diffusion is the net movement of particles, through particles of air, to an area where they are at a lower concentration
- Diffusion is the net movement of a gas or a solute from and area of high concentration to an area of low concentration as a result of the random movement of particles
- Everyday examples of diffusion
- Two everyday examples of diffusion would be:
Toast and deodorant
- Two substances that need to get out of cells:
Carbon dioxide and glucose
- Two substances that need to get into cells:
Oxygen
Sunlight (rays)
- Two everyday examples of diffusion would be:
Toast and deodorant
- During respiration carbon dioxide is produced in the respiring cell. Explain why carbon dioxide diffuses from the respiring cell into a blood vessel nearby. How does this help the cell survive?
- Carbon dioxide diffuses from the respiring cell into a blood vessel near by. Co2 is taken out of respiring cells and put into blood vessels to help the cells survive, it does this because too much co2 is toxic to the human body and if too much of it got into the respiring cells, we would die. If the co2 is placed into a blood vessel it can then be exhaled and the process repeats.
- Carbon dioxide diffuses from the respiring cell into a blood vessel near by. Co2 is taken out of respiring cells and put into blood vessels to help the cells survive, it does this because too much co2 is toxic to the human body and if too much of it got into the respiring cells, we would die. If the co2 is placed into a blood vessel it can then be exhaled and the process repeats.
- To get into or out of cells, dissolved substances have to pass through the cell membrane around the outside of it. This means only particles that are small enough can get through and particles that are too big cannot get across. Diffusion happens faster if the concentration gradient is bigger or slower if they are smaller.
- Other Facts
- Dissolved substances and gases can move in and out of a cell using diffusion.
- Diffusion occurs more rapidly when there is a larger difference in concentration.
- Dissolved substances and gases can move in and out of a cell using diffusion.
- What is diffusion?
- Cells
- How do you define a cell?
- Definition of a cell -
- There are many types of cells, the structure of a cell gives a clue to its function
- Definition of a cell -
- Examples of cells
- Fat cell
- Sperm cell
- Root hair cell
- Fat cell
- Facts you should know
- Most human cells, like animal cells contain a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes
- Plant and algal cells contain everything in an animal cell, plus many also contain cytoplasts and a permanent vacuole filled with sap
- Plant cells are different from animal cells because they have different functions
- Bacteria are much smaller than plant and animal cells
- Yeast is a single celled organism, which is different from plant and animal cells
- Cells are specialized to carry out a certain function e.g fat cell, sperm cell.
- Most human cells, like animal cells contain a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes
- How do you define a cell?
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