Mr Thembа Mоkоenа, а 64-year-оld man with a long smoking history and diagnosed with an obstructive disease, attends a preoperative assessment before elective hernia repair. He reports progressive breathlessness and a persistent cough. At rest, he breathes rapidly with a reduced tidal volume and has prolonged expiration. Pulmonary function testing produces the following results: Measurement & ResultTotal lung capacity (TLC): Within the normal rangeResidual volume (RV): IncreasedFEV₁: ReducedPost-bronchodilator FEV₁/FVC: 55%Arterial PO₂ (on room air): 55 mmHg (reference: 80–100 mmHg)Arterial PCO₂ (on room air): 55 mmHg (reference: 35–45 mmHg)Identify TWO blood-gas changes that could stimulate Mr Mokoena’s increased respiratory drive. For each abnormality, explain how it stimulates increased respiratory drive through the relevant chemoreceptors. [BLANK-1]