Editing Human body (section)

==Anatomy==
{{Main|Outline of human anatomy|Anatomy}}
[[File:Body cavities.jpg|thumb|left|upright=1.35|[[Body cavity|Cavities]] of human body]]
[[File:Human-brain-mri-gif-brain-mri-gif.gif|thumb|[[Functional magnetic resonance imaging|FMRI]] of healthy [[human brain]]]]
Human [[anatomy]] is the study of the shape and form of the human body. The human body has four [[limb (anatomy)|limbs]] (two arms and two legs), a head and a [[neck]], which connect to the [[torso]]. The body's shape is determined by a strong [[human skeleton|skeleton]] made of [[bone]] and [[cartilage]], surrounded by fat ([[adipose tissue]]), muscle, [[connective tissue]], organs, and other structures. The [[Spinal column|spine]] at the back of the skeleton contains the flexible [[Spinal column|vertebral column]], which surrounds the [[spinal cord]], which is a collection of nerve fibres connecting the [[human brain|brain]] to the rest of the body. [[Nerve]]s connect the spinal cord and brain to the rest of the body. All major bones, muscles, and nerves in the body are named, with the exception of [[anatomical variation]]s such as [[sesamoid bone]]s and [[accessory muscle]]s.

Blood vessels carry blood throughout the body, which moves because of the beating of the [[heart]]. [[Venule]]s and [[vein]]s collect blood low in oxygen from tissues throughout the body. These collect in progressively larger veins until they reach the body's two largest veins, the [[superior vena cava|superior]] and [[inferior vena cava]], which drain blood into the right side of the heart. From here, the blood is pumped into the [[lung]]s where it receives oxygen and drains back into the left side of the heart. From here, it is pumped into the body's largest [[artery]], the [[aorta]], and then progressively smaller arteries and [[arteriole]]s until it reaches tissue. Here, blood passes from small arteries into [[Capillary|capillaries]], then small veins and the process begins again. Blood carries [[oxygen]], waste products, and [[hormone]]s from one place in the body to another. Blood is filtered at the [[kidney]]s and [[liver]].

The body consists of a number of [[Body cavity|body cavities]], separated areas which house different organ systems. The brain and [[central nervous system]] reside in an area protected from the rest of the body by the [[Blood–brain barrier|blood brain barrier]]. The lungs sit in the [[pleural cavity]]. The [[Gastrointestinal tract|intestines]], [[liver]], and [[spleen]] sit in the [[abdominal cavity]].

Height, weight, [[Body shape|shape]] and other [[body proportions]] vary individually and with age and sex. Body shape is influenced by the distribution of bones, [[muscle]] and [[Adipose tissue|fat tissue]].<ref name="bartleby1918">{{cite web|url=http://www.bartleby.com/107/|title=Anatomy of the Human Body|date=1918|publisher=Bartleby|last1=Gray|first1=Henry|author-link1=Henry Gray|access-date=4 September 2016}}</ref>