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Detect the stimulus or change in 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...

Auxin moves to the lower side of the shoot and the root. This is caused by gravity. It cause the lower side of the shoot to grow faster so the shoot b...

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

The outer wrinkly layer of the brain, controls consciousness, memory and language

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

Male and female condom, diaphragm, spermicide

The movement of a plant towards light.

Receptors send messages to the CNS via the sensory neurone.

Made in the pituitary gland.Causes a egg to mature in one of the ovaries in a structure called a follicle.Stimulates the ovaries to produce oestrogen.

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...