This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 3, Subject name: Physiology
C02 is carried in blood mainly by: 
Select and explain. 
A. Dissolved form, B. Carboxy-Hb, C. Bicarbonate form, D. carbamino-compounds
C: Bicarbonate form
Answer: C: Bicarbonate form 
Explanation: C02 transpo occurs in 3 forms : 1. Bicarbonate form (70%) 2. Carbamino compounds (20-25%) 3. Free/dissolved in plasma (5-7%)