Our bodies are wild. The involuntary quick turn of the head at a shout, the vertigo at looking off a precipice, the heart-in-the-throat in a moment of danger, the catch of the breath, the quiet moments relaxing, staring, reflecting—are universal responses of the mammal body…. The body does not require the intercession of some conscious intellect to make it breathe, to keep the heart beating. It is to a great extent self-regulating: it is a life of its own. As Psalms 139:14 puts it,   “we are fearfully and wonderfully made.”

• The eyes, about the size of a Ping-Pong ball, weighs only a quarter of an ounce. The muscles operating its lenses move up to a hundred thousand times a day so that we can focus on all the varied objects that attract our attention. We would have to walk fifty miles every day just to give our leg muscles the equivalent amount of exercise. Each optic never is composed of bout 1.25 million individual fibers.
• Red Blood Cell – In the nine ounces of red marrow  in our bones, red blood cells are created at the rate of approximately two million every second to replace an equal number destroyed.
• The brain has ten million nerve cells and each has a potential twenty-five thousand interconnections with other nerve cells.
• The nose can detect up to ten thousand different odors, yet our sense of smell, located in the upper part of the nasal cavity, is no more than two patches of membrane containing several million receptors.
• The inner lining of the stomach is a mucous membrane into which are set up to thirty-five million tiny glands that secrete gastric juice to break down proteins and carbohydrates.
• In the three hundred million air sacs (alveoli) of lungs, carbon dioxide is exchanged for oxygen in one third to three quarters of a second, depending on whether we are at rest or engaged in exercise.
• The kidneys filter five hundred gallons  of blood daily.
• The heart, no bigger than a fists, pumps blood day and night through  a network of blood vessels calculated to be sixty thousand miles long. When a person is at rest, the heart pumps at sixty-six  gallons an hour. Over a lifetime of seventy years, that amounts to nearly sixty million gallons of blood. When a world-class athlete is at  the height of exertion, the rate increases six-fold. Remarkably, he heart carries out this feat with no more power than that of two tiny electric motors of the size found in many toys. It beats a hundred thousand times a day without rest our entire lives.
• The liver alone, sometimes referred to as the body’s chemical factory, is able to perform more than five hundred different functions, including the production of more than a  thousand enzymes essential for food digestion and healthy metabolism.

And how beautifully the body is organized. Each part of a cell—the average human body consists of about fifty trillion cells—and each cell as a whole performs a special function. Each tissue, in turn, is specialized to accomplish characteristic tasks. Each organ and each system are experts in particular operations for the benefit of the body as a whole.  Everything is intricately integrated.  Whenever something happens in one part of the body to disturb the existing condition, other parts compensate to restore the original condition—they adjust to maintain a steady state, or homeostasis.