Homeostasis
Greg Foot explains the role of the hormone ADH on the permeability of the kidney tubules - regulating the water levels in the body
The maintenance of a constant internal environment in the body. maintains optimal conditions for A protein which catalyses or speeds up a chemical reaction. action throughout the body, as well as all cell functions.
In the human body, these include the control of:
- blood A simple sugar used by cells for respiration. concentration
- body temperature
- water levels
These automatic control systems may involve nervous responses (Body system that includes the brain, spinal cord and nerves.) or chemical responses (The glands that release hormones into the bloodstream to regulate factors including metabolism, growth, development and reproduction.).
Nervous system
The human nervous system consists of:
- the The part of the nervous system made up of the brain and spinal cord. (CNS) – the brain and spinal cord
- the All the nerves in the nervous system except those in the central nervous system (eg those not in the spinal cord and brain). – nerve cells that carry information to or from the CNS
A diagram showing the central and peripheral nervous system