monitors levels of oxygen, carbon dioxide, hydrogen ions, and the pH in the cerebrospinal fluid and report back to the respiratory centers to modify the rate and depth of breathing based on the body’s needs.

Chemo receptors

Explanation:

Chemo receptors/ Chemo-sensors  are specialized nerve cells sensors that detect changes in certain types of chemicals le CO2, O2, and pH, and respond accordingly based upon location of the stimuli, and can be Direct or Indirect.

In the direct case, the  chemo receptors,  found in the carotid body located at the carotid artery  monitors and detects  levels of pH in the cerebrospinal fluid, oxygen and carbon dioxide in the blood and helps in breathing, the rate and depth of  of breathing according to a person's needs that is why it is very difficult for one to suffocate by holding their breath because these nerve  cells will  trigger back to the respiratory centers, an involuntary breathing response due to the critical signals  of chemicals they detect in the blood.

Indirect chemo receptors can be found in the nose and tongue for detecting smell and taste.

i believe the answer would be 1975.

hope this