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12 cards from this deck
Movement from higher to lower concentration until evenly spread
Passive transport (no energy required)
Difference in particle concentration across a space
Down gradient: high to low concentration
Oxygen and carbon dioxide
Glucose and amino acids
Sodium and potassium ions
From alveoli into blood
From blood into alveoli
From gut into blood
Maintains homeostasis (stable internal conditions)
Acquire nutrients/oxygen and remove waste like carbon dioxide
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