If a person's blood pressure decreases, receptors in the blood vessels send a message to the brain, which in turn causes the heart rate to increase and the blood vessels to decrease in diameter. The feedback loop starts with the Stimulus 'Blood pressure falls.' This is followed by the Sensor 'Blood pressure receptors stimulated.' The signal travels through the Sensory nerve fibers to the Medulla oblongata, and a response signal is sent from the Medulla oblongata through the Motor nerve fibers. The Effector is 'Heart rate increases,' which causes a “Rise in blood pressure.

What type of feedback mechanism this is, positive or negative. Explain your answer.
If this feedback mechanism is too effective and increases blood pressure higher than the set point, predict what must happen to help maintain homeostasis.
A hemorrhage, or excessive bleeding, leads to a drastic decrease in blood pressure, which, in turn, leads to a decrease in flow in coronary arteries. This decreased flow leads to decreased contraction of the ventricles of the heart, which leads to decreased cardiac output and further decreased blood pressure. What type of feedback loop this is. Explain your answer.