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12 Cards in this Set

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What is the role of tissue fluids?
Bathe cells but taking in waste products and supplying amino acids and nutrients.
What is homeostasis?
The maintenance of a constant internal environment in organisms
Give example of homeostasis

1. Maintaining the chemical make up, volume and other features of blood and tissue fluid within restricted limits



How does the maintenance of a constant internal ( outside our bodies) environment help cells?
Cells of the body are in an environment that meets their needs and allows them to function normally despite the external changes.
There can be changes in the internal environment (inside out bodies), what are they?

1. Temp


2. pH


3.Water potential

If changes occur in the internal environment, how does homeostasis manage this
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.
Reasons why Homeostasis is important 1:
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
Reasons why Homeostasis is important 2:
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.
Reasons why Homeostasis is important 3:
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.


The body is a self regulating system , what are the series of stages that feature?

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

Why are coordinators important?
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.