Approximately how often does it take for the lining of the stomach to replace itself? 4 to 5 days. The lining needs to protect itself. So has to change due to ‘juices’ that is the stomach enzymes are acid and along with abrasive foods does damage to the lining cells – hence we were built to change every 4-5 days
How long does it take a red blood cell to travel around the whole body at a normal heart rate? 30 to 60 seconds. Yes, our blood can circulate more than 1,000 times each day.
About how many muscles do you use when taking a single step forward? 200! In addition to the muscles in the leg, secondary muscles in the upper body also play a part.
The first-ever transfusion was in 1667 when the French physician Jean-Baptiste Denys transfused blood from an animal into a human. Which animal? Lamb! The 15-year-old recipient received the transfusion after being bled with 20 leeches. He survived the procedure.
What is the strongest muscle by weight in the human body? Masseter! With the help of the other muscles of mastication, this allows the average person to close their teeth with as much as 200 pounds of force with the molars.