alleryStart learning →Which part of haemoglobin actually binds oxygen?
AThe globin protein chains
BThe membrane of the red cell
CThe carbonic anhydrase site
DThe iron-containing heme
Answer & Solution
Correct answer: D. The iron-containing heme
1. Haemoglobin is a metalloprotein inside the erythrocyte.
2. Heme is the portion that contains iron.
3. It is heme that binds oxygen, so the fourth option is correct.
4. The globin portions bind carbon dioxide rather than oxygen, which is the trap in the first option.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.5 Transport of Gases_
Keep practising The Respiratory System
Browse all The Respiratory System questions for NEET PG, or explore more Physiology topics.
Related questions
Why is survival low for a baby born before 26 weeks?By how much has surfactant therapy reduced death from respiratory distress syndrome?What proportions of preterm infants are quoted as developing respiratory distress syndromeWhat happens to the fluid left in the lungs after delivery?How soon after birth does the first inhalation occur?What does the fetus move in and out during fetal breathing movements?Around which week do fetal breathing movements begin?When does a full complement of functional alveoli appear?