Produces thyroxine which is involved in regulating metabolism.

When a person becomes resistant to their own insulin. Being overweight can increase your chances of type II diabetes.

It is the master gland. It produces many hormones that regulate homeostasis e.g ADH, FSH

Outer transparent layer, bends/refracts light into the eye

The blood vessels supplying the skin constrict to close off the skins blood supply.

Produced by the ovary by the remains of the follicle. Maintains the lining of the uterus. When the level of progesterone falls the lining of the uteru...

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

Produced in the pituitary gland.Stimulates the release of an egg (ovulation) at day 14.

It makes the liver convert glucose into glycogen. This causes blood glucose levels to decrease.

Receptors send messages to the CNS via the sensory neurone.

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

Control the shape of the lens

Millions of interconnected neurones