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The Skeletal System: Crash Course Anatomy & Physiology #19

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15%of weight is bone
there are 206 bones
bones are made mostly of collagen

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Big Guns: The Muscular System - CrashCourse Biology #31

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There are 650 muscles in the human body
muscle make up 40%of body weight
It takes half as long to gain muscle as it does to loose it

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The Nervous System, Part 1: Crash Course Anatomy & Physiology #8

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There are more nerve cells in the human brain than there are stars in the Milky Way.
If we lined up all the neurons in our body it would be around 965 km long.There are 100 billion neurons in your brain alone.

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Cardiovasular structures and blood pressure

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Explain the relationship between cardiovascular structures (i.e. the heart and the blood vessels) and blood pressure

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The hear beats about 3 billion times
8 million blood cells die a second
you have about 100,000 miles of veins

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This video is for our PBS class over the Respiratory system.

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The right lung is slightly larger than the left.
Hairs in the nose help to clean the air we breathe as well as warming it.
The highest recorded "sneeze speed" is 165 km per hour.

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Digestive System, Part 1: Crash Course Anatomy & Physiology #33

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We eat about 500kg of food per year.
1.7 liters of saliva is produced each day.
The esophagus is approximately 25cm long.