Movement of particles Flashcards
Define diffusion
The movement of particles from an area of high concentration to an area of low concentration until equilibrium is met
Define semi-permeable
Allows some substances to pass through but not others
Define an exchange surface
An exchange surface is a the thay substances are moved across the membrane in an organism
What organisms need an exchange surface
Multi cellular organisms
Large organisms
Why is one adaption is to have a large surface area
More room for substances to move
Why is one adaptation of organisms with exchange surfaces thin membranes
Shorter diffusion pathway
Why is one adaptation of a organism with an exchange surface a efficient blood supply
To maintain the concentration gradient
What is the equation for respiration
Respiration=glucose+oxygen—> carbon dioxide+water
Why is one factor of diffusion the temperature
A hotter temp gives the particles more energy to move
Why is one factor of diffusion surface area
Increases the surface/space particles can move to
Why is one factor of diffusion the concentration gradient
Difference between the high conc and low conc so particles can continue to move
One example of when diffusion is used
To move oxygen into the blood
What is the SA:V ratio
The amount of surface area per volume of an object
What is the definition of SA
The area of an outer part of something
Define volume
The amount of space that an object or substance occupies
How do u work out SA
Surface area=Length XHeight Xnumber of sides
How do u work out the volume
Volume= Length X Height X Width
How does size effect SA:V
As size increase The SA:V decreases
Define Active Transport
The movement of substances from a low conc to a high conc against a conc gradient requiring energy
Define a passive process
Doesn’t require energy
What is an example of a passive process
Diffusion
Define osmosis
The movement of water from a dilute (more water) to a more concentrated (less water) solution through a semi-permable membrane
Define a dilute solution
A low concentration of sugar
A High concentration of water
Called a hypnotic solute
Define a concentration solution
High concentrate of sugar
Low concentration of water
Called a hypertonic solution
