Keywords

Homeostasis

The regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes

Optimum conditions

The perfect conditions for an organism to survive and grow e.g. glucose level, body temperature

Nervous response

Using electrical signals in nerves to make fast changes

Chemical response

Using hormones in the blood to make changes

Reflex arc

A nervous response that is fast and automatic for protection. Doesn’t involve the conscious brain.

CNS

The brain and the spinal chord (central nervous system)

Neurone

Nerve cell- carries an electrical signal from one end to the other

Negative feedback

A system where the product reduces the stimulus to return the change to normal levels

Adrenalin

Fight or flight hormone, increases heart rate and boosts blood supply of oxygen and glucose

Thyroxine

Controls metabolic rate and affects growth and development- controlled by negative feedback