Throughout this book we have learned how 100 trillion cells are individually controlled and directed by tiny, unconscious molecules, and we have seen how these molecules we call hormones establish their control over cells. We have examined the communication network among cells and we have seen how two cells, far distant from each other and without eyes or ears, can communicate with each other. And we have seen that the wonders operating deep in the human body are striking examples of God's creative artistry.
As you examined the intricacies of these wonders, the miraculous operations you were reading about continued to occur in the depths of your body. Throughout the time while you were reading this book, unconscious cells in your body were demonstrating their highly intelligent behavior.
For example, some cells measured the amount of fluid in your blood.
Other cells measured the amount of sugar in your blood numerous times, and thousands of your cells worked independently to balance that amount.
Some cells ensured that your bones mixed the proper amount calcium into your blood. In some cases, a contrary operation took place, and the excess calcium in your blood was returned to the bones.
New skin cells were constructed to replace dying ones. To do this, some cells were caused to divide and multiply. In order to adjust your body temperature, trillions of cells functioned as micro-heaters. The speed at which each cell functioned was supervised and controlled individually.
Cells determined the amount of sodium in your blood, and the required amount was supplied by special mechanisms.
Cells measured your blood pressure to prevent it from rising or falling to a dangerous level and worked day and night to take the appropriate adjustment measures.
The muscle cells around your blood vessels sometimes contracted to narrow them and sometimes relaxed to dilate them.
Some cells in your kidneys took either fluid or sodium molecules from the urine and mixed them with your blood…
And thousands of operations like these were carried out by means of your hormones.
In short, in order to allow you to survive, every point in your body was controlled individually, deficiencies were removed, and order was ensured. As you read this book about hormones, hormone molecules ensured the operation of all these wonderful functions in your body.
At this point, there is an important duty that becomes incumbent on a person: the duty to think.
Everything in the heavens and on Earth is a proof of the existence of God, and thinking is the only way to see these proofs properly.
Thinking about created things draws us closer to God and enables us to better appreciate His power, and thinking is the vehicle by which our awareness of God is increased. The Qur'an reveals that the wonders of God are found on Earth and in the heavens and describes the attitude of faithful people to these wonders.
In the creation of the heavens and the Earth, and the alternation of night and day, there are Signs for people with intelligence: those who remember God, standing, sitting and lying on their sides, and reflect on the creation of the heavens and the Earth [saying]: "Our Lord, You have not created this for nothing. Glory be to You! So safeguard us from the punishment of the Fire." (Qur'an, 3: 190-191)
The hormone system that operates in the depths of a person's body without his knowing it is a demonstration of God's marvelous signs. For this reason, it would certainly be a great mistake to look at the topics treated in this book only from a biological point of view.
Thinking about the wonders happening in our own bodies, reflecting on how they all occur and how the existing systems came to be will draw us closer to God.
There is another important conclusion to be drawn from studying the hormone system: thinking about this system will make a person more conscious of the unjust fabrications against the existence of God by the theory of evolution that denies His existence. The hormone system is an integrated whole made up of sub-systems; if one part of it does not function, the entire system will fail. It is clear from this that the claim of the evolutionists that this system came to be by chance is a fairy tale.
The person who reads this book has another duty: to do all he can to share with other people the wonders of creation he has come to understand and to tell everyone around him, sincerely, enthusiastically and from the heart, about the artistry that God has displayed. Only in this way will this book attain its purpose: to communicate to as many people as possible the intricacies of God's creative artistry.