hscintheholidays.com.auAll Rights Reserved. Page 9 of 37Central Nervous System:This acts as a CONTROL CENTRE for all the body’s responses and it coordinates all these responses, it consists of the brain (specifically hypothalamus) and the spinal chord where it receives information, interprets it and initiates a response. Peripheral Nervous System:This is a branching system of nerves that connects receptors and effectors. This system transmits messages from the central nervous system and back. It acts as a communication channel. Identify the broad range over which life is found compared with the narrow limits for individual species: –Ambient temperatureliterally means the temperature of the environment; room temperatureimplies a temperature inside a temperature-controlled building (the building has specific parts which affect the ambient temp). –Organisms on Earth life in environments with ambient temperatures ranging from less than 0ºC (such as arctic animals) to more than 100ºC (such bacteria found in boiling undersea volcano vents). –However, individual organisms cannot survive this entire range of temperatures for example mammals can only survive temperatures from about 0 - 45ºC. –This means that life is found in a very wide range of temperatures, but individual species can only be found in a narrow temperature range. Compare responses of named Australian ectothermic and endothermic organisms to changes in the ambient temperature and explain how these responses assist in temperature regulation: Analyse information from secondary sources todescribe adaptations and responses that have occurred in Australian organisms to assist temperature regulation: –Ectotherms(cold blooded): are organisms that have a limited ability to control their body temperature (due to their cellular activities generate little heat). Their body temperatures rise and fall with ambient temperature changes. Most organisms are ectotherms; examples are plants, all invertebrates, fish, amphibians and reptiles. –Endotherms(warm blooded): are organisms whose metabolism generates enough heat to maintain an internal temperature independent of the ambient temperature. Examples are birds and mammals. –Ectothermic response; Central netted dragon (Ctenophorus nuchalis): Increase in temperature (ie hotter): Stays in sheltered areas to avoid extreme heat. They can dig burrows or seek shelter in caves or crevices. This reduces the effect of heat on their body. It can change into nocturnal animal when the temperature becomes very hot. Many desert animals sleep in burrows during the day and are active at night, to escape the heat.