Human Anatomy and Physiology Textbook: Interesting Facts About the Human Body

Wednesday, March 18, 2015

Human muscle cells produce enough heat every day to boil almost 2 pints of water for an hour.
The tongue is the strongest muscle in the human body.
Muscles make around 40% of human body weight.
We utilize more than 200 muscles just to make one step.
The foot is responsible for one quarter of all the human body’s muscles
Fingers do not have muscles in them, since they are moved by tendons and attached to muscles in the forearm.
When we shiver, our muscles contract involuntarily and this releases energy that keeps the body warm.
The heart beats more than 4500 times each hour since the cardiac muscle never gets tired. While sleeping, playing sport, resting even when going into the toilet, the hearth beats on average 80 beats per minute.
While smiling, we are using about 30 muscles, which control the eyelids, nostrils and brow, working together to show emotions.

Humans have about 300 bones when born. Some of these, fuse together creating a single bone. When maturity is reached, humans have 206 bones in the body.
The teeth are not counted as bones.
The greatest bone in the body, “the femur”, is around 1/4 of the persons height.
The smallest bone in the body is the stapes (stirrup) located in the middle ear, with size around 1/10 of an inch (2.8 millimetres).
The only bone which is full-grown at birth is the stapes bone, and is situated in the ear.
Hand, fingers and wrist make the area of the body with most bones - 54.
The bones of an adult person make approximately 14 % of the total body weight.
The bones are made of approximately 75 % of water
Human bones start to grow from birth, until mid 20s.
Broken bones re-grow and repair themselves.
The human skeletal system has six major functions: 1. production of blood cells, 2. support, 3. movement, 4. protection, 5. storage of ions and 6. endocrine regulation.
The Bone marrow makes up 4% of a human body mass.

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