Cherry red discolouration of blood is due to which of the following?
Question and options
Cherry red discolouration of blood is due to which of the following?
- Nitro haemoglobin
- Oxy haemoglobin
- Carboxy haemoglobin
- Hydroxy haemoglobin
Answer and explanation
Correct answer: C - Carboxy haemoglobin
Carbon monoxide binds haemoglobin to form carboxyhaemoglobin, giving the characteristic cherry-red colour of blood and lividity. Oxyhaemoglobin gives the ordinary bright red of arterial blood, not the cherry-red hue of carbon monoxide poisoning.
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