The cause of osteoporosis

One cause of osteoporosis is low calcium. You have a special gland that has calcium sensors. If it detects low calcium in your blood, the gland sends hormones to your bone cells. Your bone cells then break down and weaken your bones in order to release calcium. This results in higher calcium in your blood.1)What is the control center in this example?2)What is the effector in this example?3)Does this example show negative feedback or positive feedback? How can you tell?

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