Muscles are attached to the bone so they can move. They are put together by tendons. Tendons also attach muscles to muscles. When you bend your arm, muscles pull against your bones. That makes your joints move. Tendons tissues stretch less than muscle tissues. Tendons are shaped like narrow cables.
how we grow
How we grow is very simple. The dairy group helps you grow the most. All the foods in the dairy group have calcium. Calcium has minerals that attach to your bones. It builds up and makes your bones grow. That makes you taller and taller.
The heart is the pump at the center of our blood system. The heart muscles automatically count the number of times it contracts, or beats, in a minute is know as the heart rate. An adults heart rate is normally 70 beats a minute. When you are born its faster. Sometimes even twice as fast. It's normally 100. Your heart rate increases as you exercise, because more oxygen carried by blood, because of the hard working muscles. If you want to measure your heart rate you can feel your pulse. The best place to feel your pulse is on your wrist. Put two fingers on your wrist and when you feel something pumping, that means you have found your pulse.