Which of the following statements is true concerning feedback mechanisms? A)Blood glucose levels are regulated by positive feedback mechanisms. B)Negative feedback mechanisms tend to increase the...

Which of the following statements is true concerning feedback mechanisms? A)Blood glucose levels are regulated by positive feedback mechanisms. B)Negative feedback mechanisms tend to increase the original stimulus. C)Positive feedback mechanisms always result in excessive damage to the host. D)Negative feedback mechanisms work to prevent sudden severe changes within the body.