Biology · PYQ NEET UG 2021

The partial pressures (in mm Hg) of oxygen (\( O_2 \)) and carbon dioxide (\( CO_2 \)) at alveoli (the site of diffusion) are:

1. A
   \( pO_2 = 159 \) and \( pCO_2 = 0.3 \)
2. B
   \( pO_2 = 104 \) and \( pCO_2 = 40 \)
3. C
   \( pO_2 = 40 \) and \( pCO_2 = 45 \)
4. D
   \( pO_2 = 95 \) and \( pCO_2 = 40 \)