(a) Define homeostasis as the maintenance of a constant internal environment.
(b) Explain the how a stimulus due to a change in the internal environment leads to a corrective mechanism that is regulated by negative feedback.
(c) Identify on a diagram of the skin: hairs, sweat glands, temperature receptors, blood vessels and fatty tissue.
(d) Describe the maintenance of a constant body temperature in humans in terms of insulation and the role of: temperature receptors in the skin, sweating, shivering, blood vessels near the skin surface and the co-ordinating role of the hypothalamus.