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  • Publicado : 27 de julio de 2010
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Identify the main parts of the human body and its characteristics.

The human body consists of head, trunk and extremities, the arms are the upper extremities and thelower legs.

One of the classification systems of the human body, with respect to its constituent components, is that established by Wang et al. in 1992:
• Level atomic hydrogen,nitrogen, oxygen, carbon and minerals.
• molecular level: water, proteins, lipids, hydroxy-apatite.
• cell level: intracellular, extracellular.
• Level anatomy: muscle tissue, fat, bone, skin,organs and viscera.
• Level full body: body mass, body volume, body density

The body is organized in different hierarchical levels. So, is composed of devices, these systems comprise them,which in turn are composed of bodies made up of fabrics that are made of cells composed of molecules.

The human body has over fifty trillion cells. These are grouped into tissues, which areorganized into organs, and these eight devices or systems: musculoskeletal (bone and muscle), respiratory, digestive, excretory, circulatory, endocrine, nervous and reproductive systems.

Itsconstituent elements are Hydrogen (H) Oxygen (O), carbon (C) and nitrogen (N), presenting many elements in lower proportions. These atoms are joined together to form molecules, whether inorganicsuch as water (the most abundant in our body, 60%) or organic such as sugars, lipids, proteins that make the human being in an extraordinary complex machine, analyzable from any level: biochemical,cytological, histological, anatomical .

When humans reach adulthood, the body is composed of about one hundred trillion cells. The skin of the human body has an approximate area of 2 squaremeters and its thickness varies between 0.5 mm on the eyelids to 4 mm in heels. The average density of the human body is about 933 kg / m³. The average height of an adult human is about 1.7 m....
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