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What causes goose bumps?

  1. Sebaceous glands

  2. Hair bulb

  3. Arrector pili muscle

  4. Dermal papilla

The correct answer is: Arrector pili muscle

The arrector pili muscle is responsible for causing goose bumps. When this muscle contracts, it pulls on the hair follicle and causes the hair to stand up, creating the bumps on the skin. Sebaceous glands, hair bulb, and dermal papilla are not directly involved in the process of goose bumps.