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Homeostasis and excretion. Homeostasis: mechanism that maintains the internal environment at a constant level. This including the blood pH, the O2 and CO2 levels, blood glucose level, blood temperature and the water balance. This is all controlled by a negative feedback system; in this the product controls its own production. This system has three parts to it: 1. Sense organ that senses the difference, 2. Control centre generates a message for 3 to act, 3. Response organ this brings on the change, after receiving the message. Due to these parts, homeostasis needs the CNS and the endocrine systems to help it control it all. Thermo-regulation: Thermo-receptors in the skin monitor the skin temperature. For the body the main source of heat is the liver and muscle movement, thus shivering when cold, to enhance muscle movement to obtain some sort of heat. Regulation: is through: 1. Sweating when water on the skin evaporates it has a...

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