This hormone (also known as Vassopressin) is secreted from the posterior lobe of the pituitary responsible for maintaining blood volume via the regulation of water uptake in the kidneys.

This is an organ system in the body which is responsible for the secretion of an array of hormones into the body which work to regulation the internal environment.

Abnormal overgrowth of the body leading to excessive size and stature. There is no set height which qualifies but it is consider that greater than 7 feet tall is significant.

The broad definition is considered to be when a couple has failed to conceive after trying for one full year.

Magnetic resonance imaging (MRI). The newest medical imaging technology available which is able to produce highly defined images of the body's interior.