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The smallest bone in your body are in your ear.
The longest bone is your femur.
Over half of your bones are in your hands and feet.

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Muscles, Part 1 - Muscle Cells: Crash Course Anatomy & Physiology #21

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Muscles make up 40% of your body weight.

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Muscles make up 40% of your body weight.

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It takes half as much time to gain muscles than lose them.
The smallest muscles are in your ear.

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The Nervous System - CrashCourse Biology #26

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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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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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involves an extensive network of vessels
This fluid drains through these lymphatic vessels
it is part of our immune system, maintains fluid balance and is essential for the absorption of fats and fat-soluble nutrients.

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Respiratory System, Part 1: Crash Course Anatomy & Physiology #31