Diffusion (AQA GCSE Biology): Flashcards
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12 cards from this deck
What is diffusion?
What is diffusion?
Movement from higher to lower concentration until evenly spread
Type of transport diffusion is
Type of transport diffusion is
Passive transport (no energy required)
What is a concentration gradient
What is a concentration gradient
Difference in particle concentration across a space
Direction particles move in diffusion
Direction particles move in diffusion
Down gradient: high to low concentration
Examples of gases that diffuse easily
Examples of gases that diffuse easily
Oxygen and carbon dioxide
Examples of small dissolved molecules that diffuse
Examples of small dissolved molecules that diffuse
Glucose and amino acids
Examples of ions that diffuse through channels
Examples of ions that diffuse through channels
Sodium and potassium ions
Where oxygen diffuses in lungs
Where oxygen diffuses in lungs
From alveoli into blood
Where carbon dioxide diffuses in lungs
Where carbon dioxide diffuses in lungs
From blood into alveoli
Where glucose diffuses in small intestine
Where glucose diffuses in small intestine
From gut into blood
Why diffusion is important biologically
Why diffusion is important biologically
Maintains homeostasis (stable internal conditions)
What diffusion allows cells to do
What diffusion allows cells to do
Acquire nutrients/oxygen and remove waste like carbon dioxide