Which of the following statement is correct regarding haemoglobin in humans?
I. In humans it is the respiratory pigment
II. It has very low affinity for oxygen
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1: Only I.
Explanation:
The analysis of the statements regarding hemoglobin in humans is as follows:
• Statement I (Correct): Hemoglobin is the respiratory pigment in humans. It is found within red blood cells (RBCs) and performs the primary function of transporting oxygen to various organs of the body.
• Statement II (Incorrect): Hemoglobin possesses a very *high* affinity for oxygen, not a low one. It is precisely because of this high affinity that it readily picks up oxygen from the lungs and transports it to the tissues via the bloodstream.
Additional Facts:
• Iron Content: Iron is found at the center of the hemoglobin molecule, where it facilitates the binding with oxygen.
• Blood Color: The red color of human blood is attributed to the presence of hemoglobin.
• Carbon Monoxide: Hemoglobin has a much higher affinity for carbon monoxide ($CO$)—approximately 200–250 times greater—than it does for oxygen; this can be fatal to the respiratory system.
• Anemia: A deficiency of hemoglobin in the body leads to a condition known as anemia, which manifests as feelings of fatigue and weakness.
Potential Questions for Upcoming Exams:
Question: Which mineral element is primarily required in the diet for the synthesis of hemoglobin?
Answer: Iron.
Question: In which specific blood cells is hemoglobin primarily found?