alleryStart learning →What does the oxygen still bound to haemoglobin in venous blood provide?
AA store of iron for new red cell production
BA buffer that keeps the blood pH constant
CA reserve for tissues that suddenly need more
DA signal that switches off the aortic bodies
Answer & Solution
Correct answer: C. A reserve for tissues that suddenly need more
1. Venous blood is called deoxygenated but still carries oxygen bound to haemoglobin.
2. That remaining oxygen forms a reserve.
3. Tissues can draw on it when they suddenly demand more oxygen, so the third option is correct.
4. This reserve is small at high altitude, which is why exertion there can trigger symptoms of low blood oxygen.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.5 Transport of Gases_
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