Biology 1 - Control in the human body

Control in the human body

1) Internal conditions that are controlled include:

* The water content of the body- water leaves the body via the lungs when we breathe out and via the skin when we sweat to cool us down and excess water is lost via the kidneys in the urine

* The ion content of the body- ions are lost via the skin when we sweat and excess ions are lost through the kidneys on the urine

* Temperature- to maintain temperature at which enzymes work best

* Blood sugar levels- to provide the cells with a constant supply of energy

2)Many processes within the body are coordinated by chemical substances- hormones. Hormones are secreted by glands and are usually transported to their target through the bloodstream

3)Hormones regulate the functions of many organs and cells. For example, the monthly release of an egg from a woman's ovaries and the changing of the thickness of her womb and…