Animals whose body temperature remains constant irrespective of environmental conditions.
Endothermic / homeothermic
Fluid found in the lymphatic system.
Lymph
Layer in the skin that gives it its colour.
Malpighian/Epidermis
Maintenance of the water content of cells within certain limits.
Osmoregulation
Pigment that gives skin its colour.
Melanin
Thick layer of fat found under the skin in whales.
Blubber
Muscles that cause hair to stand upright or lie flat.
Erector muscles
Maintenance of a constant internal environment.
Homeostasis
Receptor found in the epidermis of the skin.
Pain receptor
Gland in the skin that keeps hair oily.
Sebaceous gland
Gland that has no ducts and secretes hormones directly into the blood.
Endocrine gland
Chemical messengers that travel in the blood to target organs.
Hormones
The “master gland”in the human body.
Pituitary gland / hypophysis
Hormone that requires iodine as an essential element.
Thyroxin
Condition that results when iodine is deficient in the human diet.
Goitre
Gland that behaves like an exocrine and endocrine gland.
Pancreas
Hormone that raises the metabolic rate in humans.
Thyroxin
Cells in the pancreas that secrete insulin.
beta cells of Islets of Langerhans
Hormone that prepares the body for stress.
Adrenalin
Hormone that controls sodium levels in capillaries surrounding the renal tubules.
Aldosterone
