1. The human body is made
up of a head, neck, torso, two arms and two legs. The average height of an adult human is about
5 to 6 feet tall. The human body is made
to stand erect, walk on two feet, use the arms to carry and lift, and has
opposable thumbs (able to grasp).
2. The adult body is made
up of: 100 trillion cells, 206 bones,
600 muscles, and 22
internal organs.
3. There are many systems
in the human body:
Circulatory System (heart, blood, vessels)
Respiratory System (nose, trachea, lungs)
Immune System (many types of protein, cells, organs, tissues)
Skeletal System (bones)
Excretory System (lungs, large intestine, kidneys)
Urinary System (bladder, kidneys)
Muscular System (muscles)
Endocrine System (glands)
Digestive System (mouth, esophogus, stomach, intestines)
Nervous System (brain, spinal cord, nerves)
Reproductive System (male and female reproductive organs)
4. Every square inch of
the human body has about 19 million skin cells.
5. Every hour about 1
billion cells in the human body must be replaced.
6. The average human head
has about 100,000 hairs.
7. The circulatory system
of arteries, veins, and capillaries is about 60,000 miles long.
8. The heart beats more
than 2.5 billion times in an average lifetime.
9. There are about 9,000
taste buds on the surface of the tongue, in the throat, and on the roof of the
mouth.
10. The strongest muscle
in the body is the tongue.
11. The human heart
creates enough pressure when it pumps out to the body to squirt blood 30 feet.
12. You blink over
10,000,000 times a year.
13. The human brain
weighs about 3 pounds.
14. It takes about 20
seconds for a red blood cell to circle the whole body.
15. Only 10% of the
population are left handed.
16. One fourth of the
bones in your body are in your feet.
17. Children tend to grow
faster in the spring.
18. The most sensitive
finger on the human hand is the index finger.
19. More men are
color-blind than women.
20. More people have
brown eyes than any other color.
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