Cell biology Flashcards
What are some limitations of light microscopes?
.limited magnification
limited resolution
What are benefits of an electron microscope?
much greater magnification and resolution
What is the equation for magnification?
magnification = size of image / size of real object
What is a drug?
A substance that alters the way the body works
What is osmosis?
Osmosis is the movement of water from a high solute concentration to a low solute concentration through a partially permeable membrane.
What is active transport?
Active transport is the movement of molecules against the concentration gradient, from an area of low concentration to an area of high concentration.
What does active transport require?
Energy
Whey are cells small?
They have a large SA: vol ratio for short diffusion difference
What are adaptations of the villus?
.Thin walls
.Rich blood supply
.folded inner walls
What is absorbed at the villus?
Glucose amino acids
How are the alveoli adapted for diffusion?
.moist
.1 cell thick
.large surface area
Where does active transport occur?
Small intestine
Where does osmosis occurs?
The cell membrane
How do you work out SA: vol ratio?
Divide the surface area by the volume
