Homeostasis 0.0 / 5 ? BiologyBiologyUniversityAQA Created by: AnjelalaCreated on: 21-04-17 04:54 What is Homeostasis ? Ability to keep relatively stable internal environment , despite fluctuating external environment. 1 of 14 What is Homeostasis ? Ability to keep relatively stable internal environment despite fluctuating external environment. 2 of 14 5 survival needs are : 1) Nutrition 2)Water 3) Oxygen 4)Maintenance of pressure 5)Maintenance of pressure 3 of 14 5 survival needs are: 1)Nutrition 2)water 3)Oxygen 4)Maintenance of pressures 5) Maintenance of body temperature 4 of 14 Homeostatic control mechanism : 1)Stimulus 2)Receptor 3)Control centre 4) Effector 5) Homeostatis restored 5 of 14 Negative Feedback : Output of a system reduces intensity of the original stimulus. Mechanism causes a change in the opposite direction of the original change 6 of 14 Negative feedback : Output of a system reduces intensity of the original stimulus. Mechanism causes a change in the opposite direction of the original change. 7 of 14 Heat is defined as being : A form of energy , it can't be created or destroyed, only transferred. 8 of 14 3 methods of heat transfer: 1)Conduction2)Convection 3)Radiation 9 of 14 To cool down the blood moves From the periphery 10 of 14 To warm up the blood moves To the periphery 11 of 14 Stimulus ? Change in a regulated variable like stretch of a muscle or temperature 12 of 14 Receptor ? -Structure that detects the stimulus. -Sends input info to control centre. An example is the sensory neurones in the skin 13 of 14 Control centre ? -Integrates input info and initiates change through the effector. - Sends output info to an effector. 14 of 14
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