The answer is C. dreaming causes major muscle contractions triggered by the activation of the alpha motoneurons in the spinal cord.and tossing and turning.
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Other common conditions that affect the skeletal system include: Osteoporosis: This is a disease in which the bones become fragile and prone to fracture. Leukemia: This is a cancer of the white blood cells. Osteopenia, osteitis Deformans, and osteomalacia: Similar to osteoporosis, these are other types of bone loss
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