5 results for “contraction”

1. The Human Body

   Muscles

   contracts on its own rhythm, set by a cluster of pacemaker cells, about once a second

   Article · 4 min read

   

2. The Human Body

   The Heart and Blood

   contract hard and send it out. One-way valves between the chambers and at the exits

   Article · 4 min read

   

3. The Human Body

   Digestion

   contraction carries it down the oesophagus to the stomach in about eight seconds. This squeezing, called

   Article · 4 min read

   

4. Life & Biology

   What Is Life? The Cell

   contract, nerve cells that carry signals, red blood cells that ferry oxygen, skin cells that form

   Article · 4 min read

   

5. Space & the Universe

   The Life of a Star

   contracts and heats, and a shell of hydrogen around it begins to burn furiously. The outer

   Article · 3 min read