The muscles that contract (during cold or fright), the slanted hair follicle is pulled upright, dimpling the skin surface with goosebumps are called arrector pili muscle.
The arrector pili muscle are tiny muscle that attaches to the base of the hair follicle at one end and to the dermal tissue on the other end. When the body feels cold or fright the body generate heat and the arrector pili muscle contract all at once, that causes goosebumps on the skin.
The arrector pili muscle acts as the thermoregulator. Straight stand hair increases air trapping, so that the heat loss from the body decreases. The arrector pili muscle are mediated by the sympathetic nervous system.
To learn more about sympathetic nervous system here
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<span>: a medieval drama based on episodes from the life of a saint or martyr.
2 : mystery </span>play<span>.</span>
Answer: The second answer because, the Earth's mantle is mainly a fluid, but sometimes a solid. It rises, but never sinks.
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They do lower the activation energy but they provide an alternate pathway for the reaction to happen quicker and they do not get used up in the reaction
The correct answer is B. Natural selection occurs through generations and is in which organisms best suited to their environment survive.
