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11 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is homeostasis |
Homeostasis is the regulation of the internal conditions of a cell or organism in response to internal and external changes |
Regulation of...? In response to..? |
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Why is homeostasis important? |
Homeostasis is important because it keeps conditions constant for enzyme action and cell functions |
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Homeostasis includes the control of...? |
- blood glucose concentration - body temperature - water and ion levels |
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The control systems may involve...? |
- responses using nerves - chemical responses using hormones |
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What do all control systems include? |
-Receptors, which detect stimuli (changes in the environment) -Coordination centres, (such as the brain, spinal cord and pancreas) which receive and process information from receptors -effectors, (muscles or glands) , which bring about responses that restores optimum levels |
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What is negative feedback? |
The main method for maintain homeostasis. A control system based on information return to a source |
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Describe the process of negative feedback |
-A receptor detects a change in a stimulus -The coordinating centre compares the stimulus to a set point -an effector then produces a response to correct any difference from the set point |
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What temperature should the human body be kept at and why? |
37°C as it gives an optimum temperature for enzymes to work |
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Where is the thermoregulatory centre located |
In the brain |
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What does the thermoregulatory centre do? |
-monitors and controls body temperature -has receptors that monitor the temperature of the blood flowing through the brain -receives information (impulses) from temperature receptors in the skin |
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What happens if the temperature is too high? |
- Vasodilation... Blood vessels widen, directing more blood to the surface area - Sweat is produced from the sweat glands and evaporates to cause a cooling effect Both these mechanisms cause a transfer of energy from the skin to the environment |
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