The arrector pili muscle is a tiny muscle located at the base of each hair follicle. This muscle is responsible for causing the hair to stand on end when we experience certain emotions or when we`re cold. The contraction of this muscle is what leads to what we commonly refer to as “goosebumps.” But what exactly stimulates the arrector pili muscle to contract? Let`s explore.
One of the primary triggers of arrector pili muscle contractions is the sympathetic nervous system. When we experience a fight or flight response or when we`re in a stressful situation, the sympathetic nervous system is activated. This activation causes the release of adrenaline and noradrenaline, which in turn stimulates the arrector pili muscle to contract.
Another trigger of arrector pili muscle contractions is cold temperatures. When we`re exposed to cold temperatures, the muscles in our skin contract to help regulate our body temperature and conserve heat. This contraction also leads to the contraction of the arrector pili muscle, which causes our hair to stand on end.
In addition to the sympathetic nervous system and cold temperatures, the arrector pili muscle can also be stimulated by certain emotions. When we experience fear, excitement, or even nostalgia, our bodies can respond by causing our hair to stand on end. This is because our emotional state can impact our sympathetic nervous system and lead to the contraction of the arrector pili muscle.
It`s worth noting that the arrector pili muscle can also be stimulated by external factors like friction or touch. When we rub our skin or hair, the arrector pili muscle can contract in response to this stimulation.
In conclusion, the arrector pili muscle is stimulated to contract by a variety of factors, including the sympathetic nervous system, cold temperatures, certain emotions, and external stimulation. While this tiny muscle may seem insignificant, it plays a role in regulating our body temperature and responding to our emotional states. Understanding what stimulates the arrector pili muscle can help us better understand our body`s responses to different stimuli.