Final answer:
Chemoreceptors are sensitive to changes in blood pH and are found in the medulla and near major arteries. They monitor blood pH and trigger adjustments in breathing to maintain homeostasis.
Step-by-step explanation:
The type of receptor that is sensitive to changes in blood pH is known as a chemoreceptor. These receptors are located in the medulla and major arteries close to the baroreceptors. They are specifically sensitive to the blood levels of oxygen and carbon dioxide, as well as changes in pH, which is the concentration of hydrogen ions in the blood. A deviation in blood pH is a critical indicator that is monitored by chemoreceptors to maintain homeostasis. When these receptors detect a drop in pH, indicating increased acidity, they send signals to the respiratory centre, which in turn adjusts the breathing rate to regulate the blood pH by altering the levels of carbon dioxide exhaled.