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1.) The smallest bones in the body are found in the ear.
2.) The longest bone in the body is the femur.
3.) The bones are filled with a fatty substance called bone marrow. In this marrow, red and white blood cells are manufactured and then released into the bloodstream.

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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.) The smallest muscles are found in the middle ear.

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The Nervous System - CrashCourse Biology #26

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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 alone.

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G8 - Video Cardiac Cycle & Lymphatic System

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Uploaded by Syahirah Saupi on 2013-09-17.

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Respiratory System | The Dr. Binocs Show | Learn Videos For Kids

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1) Maintaining the balance of fluid in the blood versus the tissues (fluid homeostasis)
2) Forming part of the body's immune system and helping defend against foreign bodies such as bacteria.
3) Facilitating absorption of fats and fat-soluble nutrients in the digestive system.

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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 highest recorded "sneeze speed" is 165 km per hour.