Does salamanders give positive/negative feedback while their limb is cut off. Does salamanders give positive/negative feedback when they regenerate.

Please don't put random links and files.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes