1. What does not occur when calcium levels fall below the normal range? A. Parathyroid hormone is released. B. Calcium uptake in bone is increased. C. Calcium reabsorption in the kidney is increased? D. Calcium uptake in the intestine increased. 2.Which term refers to a neural circuit that travels through the spinal cord but does not require the coordination of the brain A. reflex circuit B. reflex arc C. afferent circuit D. efferent circuit

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