In myoglobin, the heme group acts as a strong chromophore. I…

In myoglobin, the heme group acts as a strong chromophore. In its deoxy form (ferrous, Fe²⁺ without bound oxygen), it displays a prominent Soret band at 429 nm. Upon oxygen binding, this Soret band shifts to 414 nm, and the color observed by the eye changes from purplish (deoxymyoglobin) to red (oxymyoglobin). Which of the following best explains the molecular basis for this hypsochromic (blue) shift in the Soret band upon oxygen binding?  

4. A 28-year-old patient presents to the emergency departmen…

4. A 28-year-old patient presents to the emergency department with complaints of dizziness, lightheadedness, and a feeling of choking. The patient appears anxious, with rapid breathing and hyperventilation. The following arterial blood gas (ABG) results are received: pH: 7.48 (Normal: 7.35–7.45) PaCO₂: 30 mmHg (Normal: 35–45 mmHg) HCO₃⁻: 24 mEq/L (Normal: 22–26 mEq/L) PaO₂: 90 mmHg (Normal: 80–100 mmHg) Based on these ABG results, what is the most likely diagnosis? All drop-down questions must be answered in full. Failure to provide answers for all options will result in a score of 0. [compensation] [metabolicorresp] [acidosisoralkalosis]