Chapter 1 - Communication
- Created by: stef17
- Created on: 20-04-16 09:53
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- Chapter 1 - Communication
- Homeostasis
- Temperature
- Low temp slows down metabolic reactions
- High temp can cause protein denaturation
- Amount of water
- Lack of water can cause water to move out of cells (crenation can occur), causing metabolic reactions to slow or stop altogether
- Too much can cause water to enter cells, making them burst
- Glucose concentration
- Too little can cause respiration to slow down or stop
- Too much water can cause cells to crenate due to water potential
- Done using the negative feedback mechanism
- Temperature
- Temperature regulation in endotherms (warm-blooded organisms)
- Temperature receptors
- Hypothalamus constantly monitors core temperature, all others are peripheral receptors and monitor outside temperature in order to warn of a change in core temp
- Rise in core temperature
- Vasodilation - arterioles widen to increase heat loss through radiation
- Sweat glands increase output
- Behaviour modiication
- Fall in core temperature
- Shivering - contraction of muscles to release heat energy
- Vasoconstriction - narrowing of arterioles to reduce heat loss through radiation
- Sweat glands reduce output
- Erector muscles contract and pull hairs up on end to trap a layer of hair - doesn't work well in humans
- Behaviour modification
- Temperature receptors
- Homeostasis
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