SA:V Ratio Flashcards
What is a unicellular organism?
Organism that consists of one cell (e.g. ameoba)
What is a unicellular organism?
Organism that consists of one cell (e.g. amoeba)
What is a multicellular organism?
Organisms that consist of billions of specialised cells (e.g. humans)
What materials move into an animal cell?
Glucose (energy) and oxygen
What materials move out of animal cells?
Carbon dioxide and waster
How do cells exchange materials?
Use the cell membrane as exchange surfaces, such as intaking nutroients and excreting wastes.
How do cells exchange materials?
Use the cell membrane as exchange surfaces, such as intaking nutrients and excreting wastes.
What helps with efficient exchange?
High SA:Vol ratio
What does the volume of a cell determine?
Amount of molecules to be exchanged.
What does the surface area determine?
How quickly the cell can intake required molecules. More surface area to volume=greater rate to exchange materials
Why is better for cells to be small?
As they have a higher SA:Vol ratio, which increases their efficiency to exchange materials (such as intaking nutrients and excreting waste)
What happens as a cell grows?
Volume increases more than surface area of cell membrane
Why are they microscopic?
If cell requirements are greater than what it can exchange it will die. Helps maximise SA:vol ratio
Why are RBCs flay biconcave?
It facilitates efficient exchange of oxygen and carbon dioxide.
