Warm Core, Cool Fingers

In the picture

1. 1The glowing chest inside the torso.
2. 2The narrow blood vessel inside the enlarged fingertip view.
3. 3The narrow blood vessel inside the enlarged toe view.

Examples

• Holding a snowball makes your fingers sting with cold.
• Walking barefoot on a cold floor makes your toes feel icy.

Quiz: Warm Core, Cool Fingers (Age 10)

1. 1

   What happens to the tiny blood vessels in your fingers and toes when your body needs to save heat?

   • They become narrower so less blood flows through them.
   • They become wider so more blood flows through them.
   • They stay the same but the blood inside them gets colder.
2. 2

   Why does the body narrow the blood vessels in your fingers and toes?

   • To keep the brain, heart, and other vital organs warm.
   • To make the fingers and toes warmer than the rest of the body.
   • To help the body get rid of extra heat faster.
3. 3

   What might you notice first when you are in a cold place?

   • Your fingers and toes feel cold first.
   • Your chest and heart feel cold first.
   • Your whole body feels equally cold everywhere.

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.