Muscles contract and glands secrete chemical substances(hormones).

A gap between two neurones.

Chemical messengers that travel in the blood to target organs.

The base, controls unconscious activities like breathing, movement in the intestines and heartbeat

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 blood vessels supplying the skin dilate (widen). This helps to transfer energy to the environment.

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

The maintenance of a constant internal environment.

The brain or spinal cord

Most weeds growing in a field of crops or on a lawn are broad leaved, in contrast to grasses and cereals which are narrow leaves. Selective weedkiller...

It makes the liver convert glycogen to glucose. This causes the blood glucose level to increase.

To only allow small soluble molecules (e.g. urea, water and ions) to move into the dialysis fluid, not large molecules like proteins.