When blood vessels dilate to lose heat, allowing a larger volume of blood to flow near the skin surface and transfer heat to the surroundings. This cools the skin.
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Vasoconstriction
When blood vessels constrict(narrow). This reduces the volume of blood flowing near the skin surface and, consequently, the amount of heat loss from the body.
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Effector
A part of the body that responds to change.
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Hyperthermia
A condition which the core body temperature becomes dangerously high,(above 40°C).
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Hypothermia
A condition which the core body temperature becomes dangerously low,(below 32°C).
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Shivering
A rapid contraction and relaxation of muscles in the body. Shivering generates heat, which raises body temperature.
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Hypothalamus
The Thermoregulatory centre in the brain.
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Temperature receptors
Structures in the skin that detect changes in skin temperature.
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Thermoregulation
The ability of an organism to regulate its internal temperature.
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37.5° C
The optimum temperature for enzymes in the human body.
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Core body temperature
The temperature that vital organs located deep within the body, such as the heart, liver and kidneys, are maintained at,(37.5°C).
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Enzyme
A protein in the human body that faciliates or speeds up chemical reactions. Enzymes are essential for the body to function correctly.
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Homeostasis
The process of maintaining a constant internal environment.
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Negative Feedback
When a change in the body's internal conditions results in an action to reverse the change.
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Receptor
Special cells that can detect special stimuli. Receptors are mainly found in the sense organs.
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Sebaceous Gland
A gland in the skin that produces sebum.
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Stimuli
Changes in the internal or external environment of an organism that leads to a reaction.
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Other cards in this set
Card 2
Front
When blood vessels constrict(narrow). This reduces the volume of blood flowing near the skin surface and, consequently, the amount of heat loss from the body.
Back
Vasoconstriction
Card 3
Front
A part of the body that responds to change.
Back
Card 4
Front
A condition which the core body temperature becomes dangerously high,(above 40°C).
Back
Card 5
Front
A condition which the core body temperature becomes dangerously low,(below 32°C).
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