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12 Cards in this Set
- Front
- Back
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What is the role of tissue fluids?
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Bathe cells but taking in waste products and supplying amino acids and nutrients.
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What is homeostasis?
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The maintenance of a constant internal environment in organisms
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Give example of homeostasis
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1. Maintaining the chemical make up, volume and other features of blood and tissue fluid within restricted limits |
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How does the maintenance of a constant internal ( outside our bodies) environment help cells?
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Cells of the body are in an environment that meets their needs and allows them to function normally despite the external changes.
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There can be changes in the internal environment (inside out bodies), what are they?
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1. Temp 2. pH 3.Water potential |
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If changes occur in the internal environment, how does homeostasis manage this
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Changes in temp, pH and water potential extra occur around a set point. Homeostasis has the ability to return to that set point and maintain a balanced equilibrium.
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Reasons why Homeostasis is important 1:
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pH and Temp- enzymes that control biochemical reactions are sensitive to pH and temperature . Any changes to these can reduce their efficiency, for example by denaturing. Homeostasis helps maintain pH and temp therefor the enzymes' reaction take place at a constant and predictable rate
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Reasons why Homeostasis is important 2:
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Water potential- Changes in water potential of blood and tissue fluid may cause cells to shrink and expand or even burst as a result of water moving in or out by osmosis. this means they can not operate properly. The maintenance of constant blood glucose essential, ensuring water potential. Glucose concentration also ensures a reliable source of glucose.
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Reasons why Homeostasis is important 3:
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Organisms who are able to maintain their internal environment have control of their external environment . They have a wider geographical range and therefore a greater chance of survival.
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The body is a self regulating system , what are the series of stages that feature?
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1. The set point- Desired level at which the system operates 2.Receptor- which detects any deviation from the set point 3.Controller- which coordinates info from various receptors and sends to an effector 4. Effector- Brings about changes needed to return to the set point. This return to normality creates a feedback loop 5.Feedback loop- informs receptor that changes to the system brought about by the effector |
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Why are coordinators important?
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After a receptor receives a stimulus, the controller is able to decide the perfect responses to this change ( stimulus) by sending the information to the brain and analysing if the proposed response is appropriate and if it is, its passed on to the effector which causes a response to the stimuli If any.
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