When you are older, your heart will beat a little more slowly.

If you count the beats while you are lying down, you will find that the heart beats more slowly than when you are sitting or standing.

When we run or jump, the heart beats much harder and faster.
~3.

Why the Heart Beats.~--We have learned in preceding lessons that the digested food is taken into the blood.

We have also learned that both water and oxygen are taken into the blood.