Human Physiology quizzes
How your body keeps itself running, from the heart’s own rhythm to the signals that coordinate vital functions.
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Quizzes in this topic
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Human Physiology: Membrane transport and resting potential · Diffusion and Osmosis
How molecules and water move passively across cell membranes, and why it matters for lungs, blood and brain.
23 questions -
Human Physiology: Why Your Heart Beats Without Your Brain
A tour of how the body really works, from the charge across every cell membrane to the hormone loops that keep you in balance.
50 questions
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From Human Physiology: Membrane transport and resting potential · Diffusion and Osmosis
Lung scarring thickens the walls between air and blood. Why does oxygen uptake fall?
- Diffusion slows as the distance grows
- Oxygen then needs carrier proteins
- Thick walls actively pump oxygen out
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Answer: Diffusion slows as the distance grows
By Fick's law, diffusion rate is inversely proportional to membrane thickness, so thicker barriers pass less gas per second.
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