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Why do we cry when we cut onions? Random facts about bodily fluids

Updated on October 2, 2012

What's the most needed blood type?

What is the typical pH of bodily fluids?

Arterial blood: 7.4

Venous blood: 7.35

Urine: 6.0

Saliva: between 6.0 and 7.4

How much blood is in the human body?

A man weighing 154 pounds has about 5.5 quarts of blood while a woman weighing 110 pounds has about 3.5 quarts. Ew.

How many blood vessels are in the human body?

Laid end to end, the vessels total about 60,000 miles!

What is the biggest artery in the human body?

The aorta is the biggest artery.

What blood types are the most common in the United States?

O+: 37.4%

A+: 35.7

B+: 8.5

O-: 6.6

A-: 6.3

AB+: 3.4

B-: 1.5

AB-: 0.6

The most common blood type in the world depends on the region, but O tends to be the most common (46%).

Which blood type is rarest?

Bombay blood (subtype h-h) has been found only in a Czechoslovakian nurse in 1961 and a brother and sister in Massachusetts in 1968.

How much carbon dioxide is normal in blood?

It ranges from 19 to 50 millimeters per liter in arterial blood, 22 to 30 in venous.

What percent of the body is water?

The human body is about 61.8% water in weight. Protein is 16.6%, fat 14.9, and nitrogen 3.3.

Why do eyes tear up around cut onions?

The pierced onion cells release a sulfur compound, thio-propanal-s-oxide, which irritates the eyes.

Why do some get a runny nose while eating?

Eating can stimulate the automatic nervous system to release the compound acetylcholine, which prompts increased production of saliva, stomach acid, and mucus. The spicer the meal, the greater the reaction. The condition is called prandial rhinorrhea.


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    • Patty Inglish, MS profile image

      Patty Inglish MS 

      11 years ago from USA. Member of Asgardia, the first space nation, since October 2016

      I have always wonderd why my nose runs after eating and have never remembered to look it up. Thanks very much. See what we can learn on Hub Pages!?


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