The arrector pili muscle is a minute muscle found in the epidermal layer of the skin. It is attached at the root of the hair, inside the hair's follicle. Under the control of the autonomic nervous system, these tiny muscles aid the body in temperature regulation. Sensory nerves in nerve endings of the skin send messages to the brain, which, if nessecary, triggers contraction and relaxation of the muscle, or shivering, which generates heat. This action also makes the hair stand erect, causing "goose bumps". A top-down view of skeletal muscle Muscle is a contractile form of tissue. ... Epidermis could refer to: In plants, the outermost layer of cells covering the leaves and young parts of a plant is the epidermis. ... Model of the layers of human skin In zootomy and dermatology, skin is an organ of the integumentary system; which is composed of a layer of tissues that protect underlying muscles and organs. ... A human female with brown hair. ... In botany, a follicle is a type of simple dry fruit produced by certain flowering plants. ... // Anatomy and Physiology of the A.N.S. In contrast to the voluntary nervous system, the involuntary or autonomic nervous system is responsible for homeostasis, maintaining a relatively constant internal environment by controlling such involuntary functions as digestion, respiration, perspiration, and metabolism, and by modulating blood pressure. ... Senses are the physiological methods of perception. ...
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