Contains oestrogen and progesterone. Taking oestrogen every day prevents the release of an egg by inhibiting FSH. Progesterone reduces fertility by st...

Hairs stand up, no sweat, shivering and blood vessels constrict(vasoconstriction)

Receptors in the hypothalamus detects the water content is too low. The coordinator in the brain receives the information and coordinates a response....

Glucose, water and ions.

It can be controlled by eating a carbohydrate controlled diet and getting regular exercise.

The brain or spinal cord

The chemical or neurotransmitter diffuses across the synapse and binds to a complementary receptor on the neurone (postsynaptic). This causes an elect...

A gap between two neurones.

Age, drugs e.g. caffeine or gender

Carries impulses from the receptors on the retina to the brain

Kidneys make urine by taking unwanted waste products out of your blood. They are involved in selective reabsorption.

The maintenance of a constant internal environment.

Computers can give a more precise reaction time because they remove human error.Computers can record the reaction time to a millisecond so more accura...