Your human body consists of eleven organ systems, four basic body tissues and dozens of various specialized cells - about 75 trillion cells.
Your body is always building, remodeling, reproducing, growing, converting one energy form into another, sends and receives messages, fights intruders, and performs great balancing acts.
Groups of cells form tissues, which combine to form organs. Two or more organs join together to perform vital functions, such as digestion or reproduction. This is called a system.
The eleven systems are:
Skeletal - which protects our internal parts and supports our body frame.
Muscular - enables us to move and respond to external actions.
Nervous - provides coordination of body activities - sensory organs.
Endocrine - coordination of body activities such as digestion and metabolism.
Digestive - enables food processing.
Respiratory - the gas exchange of oxygen.
Circulatory - transports nutrient and oxygen rich blood throughout the body.
Excretory - controls disposal of waste materials.
Reproductive - to ensure the survival of mankind.
Integumentary - protects against mechanical injury.
Immune - the body defense system which fights germ invasion.
All these systems combined make up your entire body. This machine has various parts which have a job to perform. All parts must work together for you to survive. If not properly maintained, this machine wears out and breaks down. If this happens, then your body cannot perform as it was designed to do.
To further illustrate this point, the most basic unit of your body is the cell. The cell contains various parts, including the nucleus. It is in this nucleus that we find one of the most fundamental molecules of life, deoxyribonucleic acid (D.N.A.). DNA serves as a blue print for life. Most of the development in your human body is both coded for and controlled by DNA. The nucleus also releases another molecule, ribonucleic acid (RNA). DNA and RNA direct the stage of development in the embryo (beginning of life). DNA is the blueprint that determines the details of the body form and function, and controls all the heredity of it. This can be observed in the development in human cells, organs and systems.
Fascinating stuff….The facts I find most interesting though.
It takes your food seven seconds to get from your mouth to your stomach.
One human hair can support 3kg (6.6 lb).
The average man's Penis is three times the length of his thumb.
Human thighbones are stronger than concrete.
A woman's heart beats faster than a man's.
There are about one trillion bacteria on each of your feet.
Women blink twice as often as men.
The average person's skin weighs twice as much as the brain.
Your body uses 300 muscles to balance itself when you are standing still.
If saliva cannot dissolve something, you cannot taste it.
No matter what....some things always remain the same
Women reading this will be finished now.
Men are still busy checking their thumbs. :P
