A growth hormone found in the roots and shoots of plants. It controls the growth of plants in response t light, gravity and water.

MRI, Electrical stimulation, Studying patients with damage to their brain.

Is a T shaped device that is inserted into the uterus to kill sperm and prevent implantation of the fertilised egg.

Abstinence (not having sex), sterilisation which is having Fallopian tubes or sperm duct cut.

Where the eye focuses light on the retina by changing the shape of the lens.

The ciliary muscles contract which slacken the suspensory muscles. This causes the lens to become fat (more curved) so increases how much light is ben...

Muscles contract and glands secrete chemical substances(hormones).

Age, drugs e.g. caffeine or gender

Contains same hormones as the pill. Patch is stuck under the skin (5cm x 5cm). Each patch lasts a week.

Hairs lie flat, sweat and blood vessels get wider(vasodilation)

A change in your environment than requires a response. e.g Light, sound, touch, pressure, pain, chemical or temperature.

Implant is inserted under the skin. Releases progesterone. Can last for 3 years. Injection lasts less time 2-3 months.