THINGS YOU DON'T KNOW ABOUT HUMAN BODY!!!!!!!!

SOME  UNBELIEVABLE FACTS ABOUT  HUMAN BODY

1. Why do we feel thirsty?

 

A feeling of thirst occurs when water loss is equal to 1 percent of our body weight. It's the brain signals you are thirsty.

The loss of more than 5 percent of water can cause fainting, and more than 10 percent can cause death from dehydration.

2.Surface area of lungs.

Total surface area of lungs may vary from 50 to 75 square metre, which is equal to the surface area of tennis court.

3.Fastest way to loose to calorie.

 Banging your head against the wall makes you lose the maximum number calories - no less than 150 calorie! But don't try this at home...

4. Strongest muscle in our body.

If you define strength as the ability to exert most pressure, then the strongest muscle in our body is the "masseter muscle". It is thick cheek muscle near the back of your jaw that opens and closes your mouth when you chew.

5.How long can human hair grow?

Human hair grows at a speed of 1/2 inch per month - strangely it grows fast during summer when you are asleep. If allowed to grow for their whole lifetime, the length of a person's hair would be about 725 kilometres.

 

6. Largest cell in body. 

The largest cell in the human body is the female egg and the smallest cell is the male sperm. From head to tail, human sperm cells measures about 50 micrometres (0.05 millimetre or roughly 0.002 inches).

A human egg is about 30 times bigger - large enough to be seen with naked eye.

7. How do we remember what we dream?

 

Human sleep occurs in several cycles during the night, each cycle consisting of 5 stages of sleep. The first 4 stages of sleep are of varying depth ranging from light sleep to deep sleep. All these stages put together referred to as non-REM sleep. The last stage of sleep is paradoxial in the sense that there is an increased activity of the brain, and is associated with roving eye movement hence called REM (rapid eye movement) sleep. Dreams typically occur during REM sleep.

8. New born baby can swallow and breathe at the same time.

Known as suck-swallow-breathe, this is a skill that may take time to learn for some babies. At birth, the epiglottis and soft palate touch during quite respiration with the mouth closed. During breastfeeding, the larynx elevates which allows the epiglottis to interlock with the soft palate. this allows the newborn to breathe and swallow at the same time - something the adult human cannot do.

9. How many cells die every second in the human body?

Cells are always created and destroyed in the human body. About 300 million cells die every minute in our body. To be precise 50,000 cells in your body died and replaced by new ones while you were reading this sentence.