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📘 How does a frog breathe through its skin?

A frog can exchange gases across its skin in a process called cutaneous respiration.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. A frog has more than one breathing surfaceDefine cutaneous respiration and distinguish it from lung and mouth lining respiration.A frog exchanges gases through skin as well as lungs and mouth surfaces.
  2. Skin, moisture, and water balanceExplain why moist skin and water balance are required for cutaneous respiration.Mucus, permeability, and habitat moisture make skin breathing possible while creating dehydration risk.
  3. Lungs, skin, and changing demandDescribe how frogs shift between skin and lung breathing as activity and environment change.Dissolved oxygen, capillaries, lungs, and metabolism share the respiratory workload.
  4. Risk, pollution, and the oxygen chainConnect permeable skin with pollutant exposure and trace the path of oxygen through skin and blood.The same permeability that supports gas exchange can admit contaminants; oxygen moves through a linked chain of conditions.

Questions this course answers

What is cutaneous respiration?

Cutaneous respiration is the diffusion of oxygen and carbon dioxide across the skin.

Match each feature to its role.

Frog skin combines a wet surface, a short diffusion path, blood flow, and water uptake.

What happens to skin breathing when dissolved oxygen in water falls?

Less oxygen outside means less driving force for oxygen to diffuse into the blood.

Why does a frog use its lungs more during intense activity?

Skin and lungs cooperate, but their relative contributions change with metabolic demand.

Put the path of oxygen through frog skin in order.

The molecule must dissolve, cross the skin, enter blood, and then be transported.

Why can pollution be especially dangerous to frogs?

The same permeability that supports gas and water exchange can allow dissolved chemicals to enter.

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