Diffusion Flashcards
Is the diffusion of particles a net or random movement?
The particles move randomly, however overall there will be a net movement from an area of high concentration to an area of lower concentration.
What is the difference in concentration between two areas called?
The concentration gradient
What factors effect the rate of diffusion?
Concentration gradient- the greater the difference, the faster it will diffuse
Surface area- increasing the area means more particles can move as a time
Temperature- increases the kinetic energy, so particles can spread out further
Diffusion distance- the shorter the distance, the quicker the particles will diffuse
What are some examples of diffusion?
- oxygen into body cells from the bloodstream
- carbon dioxide into photosynthesising plant cells
- sugars and amino acids into the gut through cell membranes.
How do substances move through the cell membrane?
Diffusion
What is diffusion?
The net movement of particles in a liquid or a gas from an area of low concentration to an area of high concentration.
Why do molecules in gases and liquids move around randomly
Because of the energy they have
What is diffusion?
The net movement of a gas or solute from an area of high concentration to an area of low concentration
What does net movement mean
Overall movement
Why does diffusion take place
Because of the random movement of the particles; all the particles move and bump into each other and this moves them around
Name one factor that increases the rate of diffusion
Concentration gradient; many particles will move randomly towards the area of low concentration
What else affects diffusion
Temperature: the particles will move more quickly so diffusion will take place more quickly
Which 3 important substances may move across a cell membrane by diffusion?
Water, simple sugars such as glucose and the amino acids produced from the breakdown of proteins during digestion
How does the air in your lungs get into red blood cells
Diffusion through cell membranes
How may a cell be adapted to increase the rate of diffusion
Increased SA, by folding the membrane or the opt issue lining of an organ
