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  2. Goose bumps - Wikipedia

    en.wikipedia.org/wiki/Goose_bumps

    Goose bumps are accompanied by a specific physiological response pattern that is thought to indicate the emotional state of being moved. [15] In humans, goose bumps occur everywhere on the body, including the legs, neck, and other areas of the skin that have hair. In some people, they even occur in the face or on the head.

  3. Arrector pili muscle - Wikipedia

    en.wikipedia.org/wiki/Arrector_pili_muscle

    Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit). [4] Each is innervated by the sympathetic division of the autonomic nervous system. [4] The muscle attaches to the follicular stem cell niche in the follicular bulge, [3] [4] [5] splitting at their deep end to encircle the ...

  4. Human vestigiality - Wikipedia

    en.wikipedia.org/wiki/Human_vestigiality

    Goose bumps are an example of a vestigial human reaction to stress. The formation of goose bumps in humans under stress is a vestigial reflex; a possible function in the distant evolutionary ancestors of humanity was to raise the body's hair, making the ancestor appear larger and scaring off predators.

  5. Why Do We Get Goosebumps? - AOL

    www.aol.com/why-goosebumps-211600084.html

    Horripilation is the technical term for goosebumps. Goosebumps have a practical purpose for animals. ... That happens when tiny muscles tighten up and make the hair on our skin stand upright.

  6. 8 Most Effective Ways to Grow Your Muscles After 50 - AOL

    www.aol.com/8-most-effective-ways-grow-120023084...

    For instance, Yeomans tells us, "Squats, lunges, and pushups all work larger muscle groups while also assuring to build muscle and support the joints." 4. Consume enough protein.

  7. Vestigial response - Wikipedia

    en.wikipedia.org/wiki/Vestigial_response

    The sudden startled arm-jerking response sometimes experienced when on the verge of sleeping is known as the hypnic jerk.. The evolutionary explanation for the existence of the hypnic jerk is unclear, but a possibility is that it is a vestigial reflex humans evolved when they usually slept in trees.

  8. The Biggest Fitness Fails You Can Make After 50 - AOL

    www.aol.com/biggest-exercise-mistakes-age-50...

    Burpees. This jumping move is exactly the type of exercise you may want to avoid as you get older. "You need the appropriate range of motion in the spine and in the hips and in the ankles to ...

  9. List of external rotators of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_external_rotators...

    Deltoid muscle; Supraspinatus; Infraspinatus; Teres minor; of thigh/femur at hip [2] Gluteus maximus; Lateral rotator group. piriformis; gemellus superior; obturator internus; pectineus ; gemellus inferior; obturator externus; quadratus femoris; Sartorius; of leg at knee [3] Biceps femoris; of eyeball (motion is also called "extorsion" or ...