During exercise, ventilation initially increases due to

A) increased blood CO₂ levels, stimulating baroreceptors.
B) decreased blood O₂ levels, stimulating chemoreceptors.
C) decreased blood pH levels, stimulating baroreceptors.
D) limb movements that stimulate the respiratory center.
E) abrupt changes in metabolism or blood gases.

Chemoreceptors

Sensory cells or organs specialized in detecting changes in chemical concentrations, often used in taste, smell, and regulation of breathing.

Ventilation

The process of moving air in and out of the lungs to facilitate gas exchange with the internal environment, primarily involving oxygen and carbon dioxide.

Blood pH

The measure of acidity or alkalinity of the blood, which is typically maintained at around 7.35 to 7.45.