The Human Body As A Whole

his article is about the human body as a whole. For components within the human body, see human anatomy.


Human body features displayed on bodies on which body hair and male facial hair has been removed
The human body is the entire structure of a human organism, and consists of a head, neck, torso, two arms and two legs. By the time the human reaches adulthood, the body consists of close to 100 trillion cells,[1] the basic unit of life. These cells are organised biologically to eventually form the whole body.
Contents   [hide]
1 Size, type and proportion
2 Systems
2.1 Cardiovascular system
2.2 Digestive system
2.3 Integumentary system
2.4 Lymphatic system
2.5 Musculoskeletal system
2.5.1 Bones
2.6 Nervous system
2.7 Reproductive system
3 See also
4 References
5 External links
[edit]Size, type and proportion

Main article: Body proportion
Constituents of the human body
In a normal man weighing 60 kg
Constituent Weight [2] Percent of atoms[2]
Oxygen 38.8 kg 25.5 %
Carbon 10.9 kg 9.5 %
Hydrogen 6.0 kg 63 %
Nitrogen 1.9 kg 1.4 %
Calcium 1.2 kg 0.2%
Phosphorus 0.6 kg 0.2 %
Potassium 0.2 kg 0.07 %
The average height of an adult male human (in developed countries) is about 1.7–1.8 m (5'7" to 5'11") tall and the adult female about 1.6–1.7 m (5'2" to 5'7") tall.[3] This size is firstly determined by genes and secondly by diet. Body type and body composition are influenced by postnatal factors such as diet and exercise[citation needed].
[edit]Systems

Main article: Organ systems
The organ systems of the body include the musculoskeletal system, cardiovascular system, digestive system, endocrine system, integumentary system, urinary system, lymphatic system, immune system, respiratory system, nervous system and reproductive system.


Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow.
[edit]Cardiovascular system
Main articles: Cardiovascular system and Human heart
The cardiovascular system comprises...