Homeostatis

A mindmap on homeostatis, endo and ectotherms and postive and negative feedback. Please rate and leave comments.

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  • Created by: Sophie
  • Created on: 08-11-12 19:13
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  • Homeostatis
    • Definition
      • Maintaining internal conditions despite external changes
    • Positive Feeedback
      • Optimum conditions
        • Change from optimum
          • receptors detect change
            • Communication systems informs effector
              • Effector reacts to increase change
                • Change from optimum
                  • receptors detect change
                    • Communication systems informs effector
                      • Effector reacts to increase change
      • Ectotherms
        • An organism that relies on external of heat to regulate its body temperature
        • Advantages
          • Use less food in respiration
          • Can survive long periods without eating
          • A greater proportion of energy can be used towards growth
        • Disadvantages
          • Less active in cooler temperatures and have to warm up in the sun so are at risk from predators.
          • May not be capable of activity in winter. have to store enough energy to survive winter without eating
        • Regulating body temperature
          • Expose body to sun - enables more heat to be absorbed
          • Orientate body to/away from the sun - exposes more/less surface area to absorb heat
          • Hide in burrow - reduces heat absorption
          • Alter body shape - exposes more/less surface area to the sun.
          • Increasing breathing movements - evapourates more water
      • Endotherms
        • regulating body temperature
          • Sweat Glands in skin
          • Lungs, Mouth and Nose - evapouration of water to cool down
          • Hairs on Skin - lie flat when hot and erect when cool to trap a layer of insulating air
          • Untitled
          • Arterioles in skin - constrict when cold, dilate when hot.
          • Liver cells - rate of metabolism increases when cold and decreases when hot.
          • Skeletal Muscles - Spontaneous Contractions to generate heat when cold.
        • An organism that uses internal sources of heat to maintain it body temperature
        • Advantages
          • Fairly constant body temperature whatever the external temperature
          • Activity possible in cooler temperatures
          • Ability to inhabit cooler parts of the world
        • Disadvantages
          • A significant part of the energy intake is used to keep warm
          • More food is required
          • Less energy from food is used for growth
    • Communication system informs effector
      • Effector reacts to reverse change
        • Optimum Condition
          • Change from Optimum
            • Receptors detect change
              • Communication system informs effector
                • Effector reacts to reverse change
                  • Optimum Condition
                    • Change from Optimum
                      • Receptors detect change
      • Endotherms
        • regulating body temperature
          • Sweat Glands in skin
          • Lungs, Mouth and Nose - evapouration of water to cool down
          • Hairs on Skin - lie flat when hot and erect when cool to trap a layer of insulating air
          • Untitled
          • Arterioles in skin - constrict when cold, dilate when hot.
          • Liver cells - rate of metabolism increases when cold and decreases when hot.
          • Skeletal Muscles - Spontaneous Contractions to generate heat when cold.
        • An organism that uses internal sources of heat to maintain it body temperature
        • Advantages
          • Fairly constant body temperature whatever the external temperature
          • Activity possible in cooler temperatures
          • Ability to inhabit cooler parts of the world
        • Disadvantages
          • A significant part of the energy intake is used to keep warm
          • More food is required
          • Less energy from food is used for growth

      Comments

      Christina

      too small to print !!!!!

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