Skin

• The skin is the largest organ of the body
• Skin is an organ of excretion and homeostasis
• Exotherms - cold blooded animals whose body temperature varies with environmental temperature. Body temperature remains just a few degrees above environment
• Endotherms - warm blooded animals with a constant body temperature and has mechanisms to warm up or cool down body
• Homeostasis controls blood sugar using insulin and glycogen produced pancreas.
• Homeostasis controls blood concentration by ADH levels at the distal convolution of kidneys.
• Homeostasis controls temperature regulation in birds and mammals by recalling skin.