Q1. [1] medium initial-understanding
Which of the following BEST explains why a deficiency of haemoglobin would affect BOTH respiration and nutrition at the cellular level?
- A Haemoglobin deficiency reduces oxygen transport to cells, so aerobic respiration is impaired; cells also receive less energy (ATP) to carry out active absorption of nutrients.
- B Haemoglobin deficiency reduces the production of digestive enzymes, so food cannot be broken down.
- C Without haemoglobin, the heart cannot pump blood, so neither respiration nor digestion can occur.
- D Haemoglobin deficiency causes excess CO₂ to accumulate in the stomach, inhibiting enzyme activity.