Cells(Diffusion And Osmosis) Flashcards
(32 cards)
Mitochondria-
Where respiration takes place
Ribosomes-
Where proteins are made
Root hair cell function
To collect water, nutrients and minerals
Root hair cell adaptations
Has a large surface area to absorb and transport water
Ciliates Epithelial cell function
Sweeps hair, mucus, trapped dust and bacteria to back of the throat to be swallowed
Ciliates epithelial cell adaptation
The cilia are tiny hair like structures that help sweep
Come cell function
Responsible for coloured vision
Come cell adaption
Comes have less stacked disks
Muscle cell function
Allow our bodies to move
Muscle cell adaption
Has bands of proteins. Is long
How do substances move into and out of cells across the cell membrane?
Diffusion, osmosis and active transport
What happens during diffusion
Molecules move from an area of high concentration to an area of low concentration. They move down a concentration gradient.
No concentration gradient-
Equilibrium
Molecules that can diffuse through a cell membrane
Water, glucose, co2, O2
How is diffusion a passive process?
No energy is needed
What does the rate of diffusion depend on
- distance the particles have to travel
- difference in concentration
Solute
A substance in solution or solvent
Factors affecting diffusion
- Concentration gradient
- size of molecules
- temperature
- distance particles travel
Why is diffusion faster when there is a large concentration ?
More particles to collide
Faster diffusion when there is a higher temperature because…
More energy so more collisions
What do living cells use diffusion for?
- getting raw materials for respiration
- removing waste products
- photosynthesis
How are alveoli adapted?
- walls one cell thick
- large surface area
- moist
- covered by network of sine capillaries
How small intestines are adapted to encourage diffusion
- folded villi increases surface area
- villi made of single layer of thin cells
- blood capillary network
Synapse is adapted to use diffusion
- Short diffusion distance
- Releases a chemical that can diffuse across the gap
