- 1(current)
Q. No.Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs:
| 1. | as bicarbonate ions |
| 2. | in the form of dissolved gas molecules |
| 3. | by binding to R.B.C |
| 4. | as carbamino-haemoglobin |
A large proportion of oxygen is left unused in the human blood even after its uptake by body tissues. This O2:
1. raises the Pco2 blood to 75 mm of Hg
2. is enough to keep oxyhaemoglobin
3. helps in releasing more O2 to the epithelial tissues
4. acts as a reserve during muscular exercise
Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as:
1. carbaminohaemoglobin in RBCs
2. bicarbonate in blood plasma and RBCs
3. free CO2 in blood plasma
4. 70% carbaminohaemoglobin and 30% as bicarbonate
1. has a lower affinity for oxygen than that of the adult
2. its affinity for oxygen is the same as stat of an adult
3. has only 2 protein subunits instead of 4
4. has a higher affinity for oxygen than that of an adult.
The 'blue baby' syndrome results from:
1. excess of chloride
2. methaemoglobin
3. excess of dissolved oxygen
4. excess of TDS (Total Dissolved Solids)
People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 meters have around 8 million. This is because at high altitudes:
| 1. | people get pollution-free air to breathe and more oxygen is available |
| 2. | atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive |
| 3. | there is more UV radiation which enhances RBC production |
| 4. | people eat more nutritive food, therefore more RBCs are formed |
The majority of carbon dioxide produced by our body cells is transported to the lungs:
1. dissolved in the blood
2. as bicarbonates
3. as carbonates
4. attached to haemoglobin
- 1(current)
Q. No.
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