Cell Transport Flashcards
define diffusion
the spreading out of particles from a high concentration of a low concentration
how fast can particles move
up to 1000mph
why is diffusion passive?
no energy is used u
what is the overall movement during diffusion called?
net movement
list six factors affecting diffusion
- temperature
- concentration gradient
- particle size
- permeability of a medium
- surface area
- distance
why does temperature affect diffusion?
the hotter the substance the faster the particles move
why does the concentration gradient affect diffusion?
the bigger the difference in concentration the faster diffusion occurs
why does particle size affect diffusion?
bigger particles move more slowly than small ones
give two examples of diffusion
- glucose from gut to blood
- all nutrients from gut to blood
- oxygen from lungs to blood
- carbon dioxide from blood to lungs
how is the gut lining adapted to aid diffusion?
- villi
- good blood supply
- large surface area
- maintains concentration gradient
how are gut cells adapted to aid diffusion?
- micro villi
- large surface area
how are lung cells adapted to aid diffusion?
- air sacs
- blood vessels
- large surface area
define osmosis
the movement of water down its concentration gradient through a partially permeable membrane
what would a flaccid cell look like?
shrivelled, smaller
describe a turgid cell
bulging, larger
