Transport in Cells (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards
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Definition of diffusion
Definition of diffusion
Movement of particles from higher to lower concentration until evenly spread
Type of transport diffusion is
Type of transport diffusion is
Passive transport
Does diffusion require energy?
Does diffusion require energy?
No, it's passive (no energy from cell required)
Concentration gradient definition
Concentration gradient definition
Difference in concentration of particles across a space
Direction of diffusion movement
Direction of diffusion movement
From higher to lower concentration (down gradient)
Examples of gases that diffuse easily
Examples of gases that diffuse easily
Oxygen and carbon dioxide
Small molecules in water that can diffuse
Small molecules in water that can diffuse
Glucose and amino acids
Ions that may need channels to diffuse
Ions that may need channels to diffuse
Sodium and potassium ions
Where oxygen diffuses in the lungs
Where oxygen diffuses in the 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
What diffusion helps maintain
What diffusion helps maintain
Homeostasis (stable internal conditions)
Why diffusion is vital for cells
Why diffusion is vital for cells
Cells get nutrients/oxygen and remove waste like CO2
What causes diffusion to occur naturally
What causes diffusion to occur naturally
Random motion of particles