Homeostatis
A mindmap on homeostatis, endo and ectotherms and postive and negative feedback. Please rate and leave comments.
- 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
- Effector reacts to increase change
- Communication systems informs effector
- receptors detect change
- Change from optimum
- Effector reacts to increase change
- Communication systems informs effector
- receptors detect change
- Change from optimum
- Optimum conditions
- 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
- regulating body temperature
- Definition
- 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
- Receptors detect change
- Change from Optimum
- Optimum Condition
- Effector reacts to reverse change
- Communication system informs effector
- Receptors detect change
- Change from Optimum
- Optimum Condition
- Effector reacts to reverse 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
- regulating body temperature
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