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The Skeletal System: Crash Course Anatomy & Physiology #19

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1. Over half the body's bones are in the hands and feet.
2. The only joint-less bone in your body is the hyoid bone in your throat.
3. The smallest bones in the body are found in the ear.

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How your muscular system works - Emma Bryce

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1. Muscles make up 40% of your total body weight.
2. It takes half as long to gain muscle than it does to lose it.
3. To take one step, you use 200 muscles.

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Watch this movie about your nervous system, starring your brain.

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

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The Cardiovascular and Lymphatic Systems

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Covers the cardiovascular and the basics of the lymphatic system. Also covers heart function and blood pressure.

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1. The right lymphatic duct measures only about 1.25 centimeter (cm) in length, while the thoracic duct may measure as long as 45 cm.
2. Ranging from 500 to 700 hundred in number, the lymph nodes are the small organs which compose the lymphatic system.
3. In some cases, the lymphatic system diseases may even go ignored or unnoticed even for many years.

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Watch this movie about the respiratory system, the system that enables you to breathe.

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1. The right lung is slightly larger than the left.
2. Hairs in the nose help to clean the air we breathe as well as warming it.
3. The surface area of the lungs is roughly the same size as a tennis court.

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Digestive & Excretory System - Organs, Diseases, How They Work Together

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1) The average person pees about 3000 times a year.
2) Most people, on average, would breath about 6286920 times in their lifetime.
3) The human intestine is usually 27 feet long and 10 inches.