alleryStart learning →When is haemoglobin described as saturated?
AWhen one of its four heme sites is occupied
BWhen two of its four heme sites are occupied
CWhen all four of its heme sites are occupied
DWhen none of its four heme sites is occupied
Answer & Solution
Correct answer: C. When all four of its heme sites are occupied
1. Haemoglobin has four heme sites, each able to hold one oxygen molecule.
2. It is saturated when all four are occupied.
3. With one to three sites occupied it is described as partially saturated.
4. So the third option is correct.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.5 Transport of Gases_
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