How does man move:

Dear believing brothers, when someone moves from one place to another, lifts something, or does a certain physical work, what is the secret behind such movement or work? The answer is: The muscles. When you go to the butcher to buy some meat, the meat you buy is made up of muscles. Due to His Infinite Divine Wisdom, Allah the Almighty has made muscles of millions of fibers each of which ends in a nerve. 

When orders come to these fibers from the brain or from the nervous system, they contract and become 60% shorter than they usually are. In other words, a muscle fiber whose ordinary length is 10 cm's becomes only 4 cm's long when it contracts. Contraction of muscles, which are connected with bones, causes the bones to move. In fact, without this property of contraction which Allah the Almighty has given to muscles man would be like a motionless log lying on the ground. 

The volitional movement of muscles, movement of limbs, and movement of your head and hands …etc, are all based on the bone system, each bone of which is connected with a couple of muscles that move it easily and smoothly in different directions. What is this secret?!

No one so far knows exactly how food energy that exists in the cells of muscles is changed into work or movement, i.e. mechanical energy! This miraculous phenomenon is still very much of a mystery! The whole matter could be summed up as follows: A muscle, which ends in a nerve, receives an order from the brain or the nervous system to contract; and when it contracts, it makes a certain bone move. This is simply how we move. You might be sitting in the living room, for example, and suddenly you notice that your little son is going directly towards the stove, so you jump forward to hold him back. 

This means that in a single instant, you conceive danger and, therefore, an order goes, quite suddenly and quickly from your brain to the muscles, which, in turn move and help you jump to him and take him away from danger. This is an amazingly complicated process the facts of which are still not known!

Number of muscles in human body and their components:

Scientists say: A medium size muscle has 10.000.000 fibers; and man has 600 muscles, 500 of which are volitional, while 100 are non-volitional, i.e. reflex. If you are sitting in a dark room, for example, and suddenly the light is turned on, the iris of your eye automatically begins to contract. Now, the question is: can you prevent the iris from contracting or expanding? The answer is: definitely not, because it is a non-volitional muscle.

The iris of the eye is a muscle, but its movement is not controlled by you, and the same goes for the heart, the lungs, the intestines, and the narrowing of the arteries and veins. I repeat what I have just mentioned; Out of the 600 muscles in your body, Allah the Almighty has made 500 of which volitional, while He the Almighty has made 100 of them non-volitional, i.e. reflex, so they move while you are unaware.  

One more thing, dear brothers, the smooth muscles pass through another nervous system, so you eat and sleep, the stomach moves, the intestines move, the organs move, the lungs move, and you do not know. This miraculous creation is Allah's, Who has perfected all things. Does not such Infinitely Great Creator deserve to be worshipped and obeyed?! 

When someone climbs the stairs from one floor to another, this means that he carries his body, which weighs 70 kg's on average, and moves it 3 meters up. This effort equals nearly 1.5 horsepower, which is really miraculous. When man moves, eats, lies down, walks, runs, lifts or carries things, he should always think of Allah's Divine Words about him. Allah the Almighty says:

(So let man see from what he is created!* He is created from a water gushing forth* Proceeding from between the back-bone and the ribs)

[At-Tariq, 5-7]

He also says: 

(Verily, We created man of the best stature (mould)* Then We reduced him to the lowest of the low) 

[At-Tin, 4-5]

Conclusion:

Dear believing brothers, pondering over muscles, alone, is enough to make you firmly believe in Allah, Exalted and Sublime be He, Without muscles, no human being could do anything, and no human civilization could ever have been established on earth. Yes, indeed! Allah the Almighty has made human movement and work conditional on an amazing muscular system, which, in turn, is based on a miraculous nervous system! How is food energy turned into mechanical one is still very much of a mystery!