Activity and Temperature

Mind Map by , created almost 6 years ago

Mind map on activity and termperature. HSC Syllabus dot points are in bold.

Created by ellencregan almost 6 years ago
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Activity and Temperature
1 Identify the role of enzymes in metabolism, describe their chemical composition and use a simple model to describe their specificity on substances
1.1 Metabolism: refers to the countless chemical processes that are continually going on inside the body to keep it functioning properly.
1.1.1 Molecules are: 1. Broken down 2. Combined 3. Exchanged
1.1.2 This process is regulated by ENZYMES
1.2 Enzymes are lage protein molecules that can be used over and over again. They are made in a cell when they are needed.
1.2.1 They are biological catalysts They speed up the rate of reaction or slow it down but are not chemically changed at the end of the reaction.
1.3 Lock and Key model suggests that each enzyme is created for a certain reaction. The induced fit model sugegstis that enzymes are plactic-like and can mold to fit a reaction
2 Enzymes need certain conditions for maximum efficiency
2.1 PH
2.1.1 Identify the pH as a way of describing the acidity of a substance Acidity is measured on the pH scale, which ranges from 0 to 14. Substances with a 7 pH are 'neutral'. Below 7 is 'acid' and above 7 is 'alkaline.'
2.2 Concentration
2.3 Temperature
2.4 Explain why the maintainance of a constant internal environment is important for optimal metabolic efficiency
2.4.1 All enzymes work best under optimum conditions. Cells need to maintain an optimum environment for their enzymes to function.
2.4.2 HOMEOSTASIS Describe homeostasis as the process by which organisms maintain a relatively stable internal environment Explain that Homeostasis consits of two stages Two stages: 1. detecting changes from the stable state 2. counteracting changes from the stable state. Responses are brough about by effectors. In Mammals: Muscles resond by contracting or relaxing, thus bringing about movement Glands respond by secreting a chemical substance such as the salivary glands in the mouth produce saliva when food is detected. Outline the role of the nervous system in detecting and responding to environmental changes The human nervous system is made up of the central nervous system, the brain and the spinal chord. It recieves information, interprets it and initiates a response. The Preipheral nervous system is a system of nerves branching out throughout the body to and from the receptors and effectors. These act a communication channels and pass messages rapidly to the central nervous system and back The endorcine system produces hormones. Identiify the broad range of temperatures over which life is found, compared with the narrow limits for individual species.