Human Bones, Joints and Muscles Facts:
Your bones are composed of 31% water.
Your bones, pound for pound, are 4 times stronger than concrete.
A muscle called the diaphragm controls the human breathing process.
Bone is stronger than some steel.
Bones make up only 14% of our weight.
At birth we have over 300 bones. As we grow up, some of the bones begin to fuse together as a result an adult has only 206 bones.
The muscles of our body constitute 40% of our body weight.
The muscles of the eye move more than 100,000 times a day.
The muscles that control your eyes contract about 100,000 times a day (that’s the equivalent of giving your legs a workout by walking 50 miles).
If you remove the minerals from a bone by soaking it overnight in a six percent solution of hydrochloric acid, it will become so soft, you could tie it in a knot.
There are 22 bones in the human skull.
The hardest bone in the human body is the jawbone.
The human skeleton renews once in every three months.
The human body consists of over 600 muscles.
Human bone is as strong as steel but 50 times lighter.
Human fingers stretch and bend about 25 million times in a normal lifetime.
Human speech is produced by the interaction of 72 muscles.
Humans have more facial muscles than any other animal on earth – 22 on each side of the face.
It takes 17 muscles to smile and 43 to frown.
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
Muscle tissue is three times more efficient at burning calories than fat.
One person in 20 has an extra rib, and they are most often men.
Our Muscles often work in pairs so that they can pull in different or opposite directions.
The feet account for one quarter of all the human body’s bones.
The femur/thigh bone is the longest bone in our body, it is about a quarter of ones height.
The heart muscles will stop working only when we die.
The human body has 230 movable and semi-movable joints.
The human body has less muscles in it than a caterpillar.
The Hyoid bone, in your throat is the only bone in your body which not attached to other bones.
The leg bone is the fastest growing bone in the human body.
The length of your foot is the same as that of your forearm between your wrist and the inside of your elbow.
The longest muscle in the human body is sartorius, which is present in the hip region and it is commonly called as tailors muscle.
The only joint-less bone in the human body is the hyoid bone, which is present in the throat area.
The shoulder blade is connected to the body by means of 15 different muscles and it is not attached to a single bone.
The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
The strongest muscles of the human body are masseters, which are present on either side of the mouth.
The thighbone is so strong that it withstands the axial load of about 1600-1800 kilos.
The tiniest muscle, the stapedius of the middle ear, is just one-fifth of an inch long.
The tips of your fingers have enough strength to support the weight of your whole body.
The tongue is the strongest muscle in the human body.
We exercise at least 36 muscles when we smile.
When you were born, you had 300 bones. Now you have 206, if you are an adult. The rest of the bones have not disappeared – they have merely fused together.
You sit on the biggest muscle in your body, the gluteus maximus a.k.a. the butt.
You use 200 muscles to take one step.
Your foot contains 25% of all the bones within your body.
Your ribs move about 5 million times a year, every time you breathe!

Source:  https://www.disabled-world.com/medical/human-body-facts.php