Why is saliva important?

Saliva begins the digestive process and keeps the mouth lubicated. During one lifetime, a person can produce enough saliva to fill two swimming pools.

Do women's hearts beat faster then men's?

Yes, they do because women tend to be smaller then men and also have less mass to pump blood to.  Medical research has also found that many treatments (for heart attack) that work for men have to be adjusted to work for women.  

Do our feet have sweat glands?

Feet have 500,000 sweat glands which can produce about a pint of sweat a day. THis may help explain why gym shoes can smell. Men also have more sweat glands  then women do.  

How many functions does the liver have?

It is said that the liver has over 500 different liver functions, and is one of the busiest organ in the body. It produces bile, helps in the decomposition of red blood cells, synthesises plasma protein, and aids in detoxification, and many more.  

How fast is a sneeze?

We can sneeze at speeds of 100 mph, which is a good reason to cover our mouths when sneezing. Have you ever tried keeping your eyes open when sneezing?  

How often does the stomach lining replace itself?

The reason why the stomach lining keeps replacing itself, every 3 to 4 days,  is that it would, otherwise,  dissolve due to our strong digestive acids.  An ulcer is when the stomach acids burn through the lining quicker than it can replace itself. Ouch!! 

How many blood vessels does the human body have?

The human body has about 60,000 miles of blood vessels. The distance around the earth is 25,000 miles.

How large is a human lung?

The surface area of a human lung is equal to a tennis court. The lungs are filled with thousands of branching bronchi and clusters of alveoli
which oxygenate the blood.

What is stomach acid ?

The hydrochloric acid found in your stomach is strong enough to dissolve many kinds of metal. 

Which is the largest internal organ?

The small intestine is 4 times as long as the average adult is tall. 

How much energy does the brain use?

The brain uses as much power as a 10 watt light bulb, even when asleep.

How smart is the human brain?

The human brain cell can hold 5 times as much information as the Encyclopedia Britannica.  

How much heat does the body generate?

The body gives off enough heat in 30 minutes to bring half a gallon of water to a boil. The body gives off a large amount of calories to keep us at a steady 98.6 degrees.

Quotes

Every day an adult body produces 300 billion new cell.

How much water is in the brain?

Our brain is 80% water; it's not the firm, gray mass we think it is. It's more like jelly with a high water content. Therefore, it's important to keep the brain hydrated.

How much oxygen does the brain use?

Your brain uses 20% of the oxygen that enteres your bloodstream, yet only makes up 2% of  your body mass. This makes is very vulnerable to oxygen deprivation.

Keep deep breathing to keep your brain working at it's best.

This explains why we stop thinking clearly when anxious, as in fight or flight,  as our Central Nervous System sends more available oxygen to our limbs.