Fichas
Cell Movement
Fichas del conjunto (16)
- 1The three main types of movement in and out of cells are called?Diffusion, osmosis and active transport.
- 2What is diffusion?The net movement of particles from an area of high concentration to an area of low concentration.
- 3When does diffusion occur?When the particles are free to move. This is in gases and particles dissolved in solutions - but diffusion not in solids.
- 4How does the smell of cooking travel around the house from the kitchen?Particles diffuse down a concentration gradient, from an area of high concentration to an area of low concentration.
- 5In digestion, how do products dissolved in water pass across the wall of the small intestine by diffusion?Their concentration is higher in the small intestine than their concentration in the blood, so there is a concentration gradient from the intestine to the blood.
- 6In what process does oxygen move down a concentration gradient from the air in the alveoli to the blood?Respiration.
- 7How does carbon dioxide move from the blood to the alveoli in respiration?Carbon dioxide moves down a concentration gradient from the blood to the air in the alveoli.
- 8How long do the diffused substances continue to diffuse?The dissolved substances will only continue to diffuse while there is a concentration gradient.
- 9What is osmosis?Osmosis is the diffusion of water molecules, from a region of higher concentration to a region of lower concentration, through a partially permeable membrane.
- 10What is a partially permeable membrane?Partially permeable membranes are also called selectively permeable membranes or semi-permeable membranes. They let some substances pass through them, but not others.
- 11What happens to a plant cell in a dilute solution (higher water potential than the cell contents)?Water enters the cell by osmosis. The cytoplasm pushes against the cell wall and the cell becomes turgid.
- 12How does osmosis cause a plant to become flaccid and wilt?When a plant cell is in a concentrated solution (lower water potential than the cell contents) water leaves the cell by osmosis. The cytoplasm pulls away from the cell wall (plasmolysis) and the cell becomes flaccid and the plant wilts.
- 13Animal cells don't have cell walls so how are they affected by osmosis?They change size and shape when put into solutions that are at a different concentration to the cell contents.
- 14In red blood cells what would happen if they gained water?They would swell and burst in a more dilute solution (this is called haemolysis).
- 15What causes red blood cell to become crenated or wrinkled?Red blood cells lose water and shrink in a more concentrated solution.
- 16Why do these things not happen inside the body?Osmoregulation involving the kidneys ensures that the concentration of the blood stays about the same as the concentration of the cell contents.
Información
- Descripción
- GCSE (Biology) Science Fichas sobre Cell Movement, creado por Becca Westwell el 17/02/2015.
- Creado por
- Becca Westwell
- Visitas
- 7
- Etiquetas
- Valoración