Male and female condom, diaphragm, spermicide

Chemical messengers that travel in the blood to target organs.

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...

Neurones that carry information from the CNS to the effectors.

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

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

Produced by the ovaries. Causes the lining of the uterus to grow. Stimulates the release of LH (which causes ovulation) and inhibits the release of FS...

The hole in the centre where light enters

In dim light a reflex is triggered to make the pupil dilate. The CIRCULAR muscles RELAX and the RADIAL muscles CONTRACT.

Millions of interconnected neurones

The maintenance of a constant internal environment.

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