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homeostasis

homeostasis, reproduction, adaptation

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Topic 1 Assignment The three topics that I have chosen to examine for the first assignment are: reproduction, adaptation and homeostasis. All eight the components that are necessary to be termed a living entity are worthwhile, but these are the three that most peaked my interest in which I wanted to learn more about the process in answering necessary assignment questions. Reproduction Every living thing has to be able to reproduce in order to maintain being a living thing. Every living organism, eventually dies. If there is no reproduction or offspring, that species, would eventually die out or become extinct. Examples of organisms that reproduce are everywhere around us in the world, from plants and animals to parasites and red blood cells.

Part 2 Biology Revision Notes for AQA GCSE A/A*

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B3.3 Keeping internal conditions constant 3.1 Controlling internal condition Keeping the conditions in the in the body within a narrow range is called homeostasis. Temperature, blood glucose, water and ion content and levels of waste products must all be controlled Waste products that have to be removed include; CO2 (produced by respiration) removed by the lungs urea (produced in the liver when amino acids are broken down) removed by the kidneys and temporarily stored in the bladder Water and ions enter the body when we eat and drink. If the water or ion content in the body is wrong, too much water may move into or out of the cells. This could damage or destroy the cells 3.2 The human kidney

homeostasis

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homeostasis

Homeostasis Maintaining internal balance whoaa! Mechanisms of homeostasis moderate changes in the internal environment Any homeostatic control system has 3 functional components: a receptor, a control center and an effector Regulators & Conformers regulators try to maintain the parameter at a constant level even with varying environmental variations. (ex: ectothermic animals? almost all other organisms?exhibit wide body temperature variation. (ex: endothermic mammals and birds maintain a constant body temperature) conformers allow the environment to determine the parameter. Negative feedback A change in an internal variable will stimulate a response that counteracts the initial fluctuation until the system goes back to its normal state Negative feedback Negative feedback
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