Osmosis and animal cells Flashcards
What happens if an animal cell is in a solution that is the same concentration as their cytoplasm
Water will move in and out through its cell membrane at the same rate i.e. the volume of the cell will remain the same
Give an example of where a human cell is in a solution of the same concentration as their cytoplasm
The kidneys ensure that plasma in our blood has the same concentration as our blood cells
Give an example of where animal cells are in a solution of the same concentration of their cytoplasm
The cells of most land animals are surrounded by tissue fluid that has the same concentration as the cells
What happens if an animal cell is in a solution that is less concentrated than the cell
Water will move into the cell as a result of osmosis i.e. the cell will enlarge and may burst (lysis) and die
Give an example of a cell found in a solution that is less concentrated than the cell
Amoeba are single-celled organisms that live in freshwater pools which are less concentrated than the cell contents of Amoeba
Why do Amoeba not enlarge or burst in freshwater pools which are less concentrated than their cell contents?
Ameoba have an osmoregulation system consisting of a contractile vacuole which expels water and prevents lysis
Why do Amoeba in salt water pools not have an osmoregulation system?
The sea water has the same concentration as their cells therefore excess water does not enter their cells
What happens if an animal cell is in a solution more concentrated than their cell?
Water will move out of the cell as a result of osmosis which will cause the cell to shrivel (crenation) and possibly die
Give an example of a organism found in a solution that is more concentrated than their cells?
Aquatic animals in an environment which becomes too salty
Give an example of a human cell in a solution that is more concentrated than their cells?
Red blood cells in a salty solution
What is lysis?
The bursting of a cell due to the movement of water from a less concentrated solution into the cell
What is crenation?
The shrivelling of a cell due to the movement of water out of the cell into the more concentrated solution
