Why Don't Penguins' Feet Freeze?

The video explores how penguins survive extreme cold, focusing on their unique adaptations. Penguins maintain their body warmth with fat and feathers, while their feet are adapted to withstand cold through countercurrent heat exchange. This mechanism allows them to conserve energy by keeping their feet just above freezing. The video also compares this adaptation to human physiology, highlighting differences in cold resistance.

What is the primary reason penguin feet do not freeze in the extreme cold of Antarctica?

• They have a special type of fur on their feet.

• Their feet are made of a unique metal.

• Their feet are always moving to generate heat.

• They have special adaptations to keep blood just above freezing.

How do penguins protect the muscles that control their feet?

• By keeping them inside their warm body.

• By covering them with feathers.

• By constantly moving their feet.

• By wrapping them in a special membrane.

What material are penguin feet primarily made of?

• Bone and keratin

• Feathers and scales

• Cartilage and fat

• Muscle and skin

What is the main function of countercurrent heat exchange in penguins?

• To cool down their body temperature.

• To make their feathers more insulating.

• To keep their feet just above freezing without wasting energy.

• To help them swim faster.

How does human countercurrent heat exchange differ from that of penguins?

• Humans have a more efficient system than penguins.

• Human blood vessels do not wrap around each other.

• Humans do not use countercurrent heat exchange.

• Humans have blood vessels that wrap around each other.