( series of mechanical body, part 1 )
If you difficult to get your driving license, don’t be disappointed, because The God have given you very-very super vehicle. Yes, your body is super vehicle what belong to you with unnecessary licenses. So, you can go anywhere you want by your foots and free.
You can turn right or left easily, can stop anywhere and run faster in control. Like driving a vehicle, your brain tells your muscles what to do, and they respond. Sensors like your eyes, ears and nose bring information to your brain, so your brain can decide what to do next. Let’s look at some of the technology that makes your body so amazing.
Your parts of body that interesting to understand are eyes, bones, muscles, heart and blood. All of them can be learned by comparing with modern equipment like digital camera, lifting machine, hydraulic system, and so on.
Eyes
How to learn the eyes easily ? You can compare your eyes system by digital camera. If you have camera with megapixel resolution, it’s mean that there are 5 million little light sensors inside the camera. In your eyes there are more then 120 million cell sensors that called “Rod’. So, it’s mean that your eyes have 24 times sensitivity more then camera to detect the object. 
There two kind of sensor cells inside your eyes, ‘Rods’ and ‘Cones’. The Rods give your eyes ability to detect black and white vision, and night vision. And, you can understand color differences because you have Color – vision cells called Cones. There are about 6 to 7 million cones cell which packed one in part of eyes area called ‘fovea’. Fovea and Rod cells spread in black area in your eyeball called ‘The Retina’.
The rod cell can detect a single candle light on 1 miles away. It’s because there are chemicals in rod cell called ‘Rhodopsin’ that very sensitive by a light. If rhodopsin receive a photon of light, their molecule will be changes and send a signal into your brain.
To make rhodopsin, your body need vitamin A. If content of vitamin A in your body not enough, your night vision become poor. So, you must eat more carrots to improve your vision capability.
In fovea you have three kinds of cones : red, green, and blue. Each 100 cones there are 64 red cones, 32 green cones, and 4 blue cones. It’s reason why the people more sensitive in red then others. And this one is reason in traffic light, why red light use the red light to sign the stop.
( The Bones in next article … )
ref : www.howstuffworks.com
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