Editing Human body (section)

==Physiology==
{{Main|Outline of physiology|Physiology}}

Human [[physiology]] is the study of how the human body functions. This includes the mechanical, physical, [[Bioelectromagnetics|bioelectrical]], and [[Biochemistry|biochemical]] functions of humans in good health, from [[Organ (biology)|organs]] to the [[Cell (biology)|cells]] of which they are composed. The human body consists of many interacting systems of organs. These interact to maintain [[homeostasis]], keeping the body in a stable state with safe levels of substances such as sugar and oxygen in the blood.<ref name=UL>{{cite web |title=What is Physiology? |url=http://www.understanding-life.org/what-physiology |publisher=Understanding Life |access-date=4 September 2016 |archive-url=https://web.archive.org/web/20170819102127/http://www.understanding-life.org/what-physiology |archive-date=19 August 2017 |url-status=dead }}</ref>

Each system contributes to homeostasis, of itself, other systems, and the entire body. Some combined systems are referred to by joint names. For example, the nervous system and the endocrine system operate together as the [[Neuroendocrinology|neuroendocrine system]]. The nervous system receives information from the body, and transmits this to the brain via [[Action potential|nerve impulses]] and [[neurotransmitter]]s. At the same time, the [[endocrine system]] releases hormones, such as to help regulate [[blood pressure]] and volume. Together, these systems regulate the internal environment of the body, maintaining blood flow, posture, energy supply, temperature, and acid balance ([[pH]]).<ref name=UL/>