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Concept
Arrector Pili Muscle
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Summary
The
Arrector pili muscles
are small,
Smooth muscles
attached to
Hair Follicles
in mammals that contract involuntarily to cause
Hair to stand erect
, a response commonly known as 'goosebumps'. This
Physiological reaction
is primarily triggered by cold or
Emotional stimuli
and serves an
Evolutionary purpose
by creating an
Insulating layer of air
or making an
Animal appear larger
to threats.
Concepts
Smooth Muscle
Autonomic Nervous System
Thermoregulation
Sympathetic Nervous System
Fight Or Flight Response
Vestigial Reflex
Follicular Unit
Hair Follicle Structure
Hair Follicle Anatomy
Relevant Degrees
Animal Behavior and Ecology 100%
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