L9 Transport of CO2

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What is the total amount of carbon dioxide transported in 100 ml of arterial blood under normal resting conditions?

42 ml

48 ml (correct)

45 ml

3 ml

What is the main mechanism by which carbon dioxide is transported in the blood?

Bicarbonate (correct)

Carbamino compound

Physical solution

Carbonic anhydrase

What is the Cl- shift phenomenon?

The transport of CO2 as carbamino compounds

The exchange of Cl- and HCO3- ions between the red blood cells and plasma (correct)

The dissociation of CO2 from hemoglobin

The buffering of CO2 by hemoglobin

How does the Bohr effect differ from the Haldane effect?

The Bohr effect describes the effect of pH on the oxygen-hemoglobin dissociation curve, while the Haldane effect describes the effect of CO2 on the oxygen-hemoglobin dissociation curve. Signup and view all the answers

What is the main function of carbonic anhydrase in the transport of CO2?

To catalyze the conversion of CO2 to bicarbonate Signup and view all the answers

What percentage of the tidal CO2 is transported as carbamino compounds?

25% Signup and view all the answers

What is the purpose of the Haldane effect in the transport of CO2?

To facilitate the dissociation of CO2 from hemoglobin in the lungs Signup and view all the answers

What is the main reason for the decrease in pH from 7.4 to 7.34 due to the transport of tidal CO2?

The dissolution of CO2 in the physical solution Signup and view all the answers

What happens to HCO3- as CO2 enters a red blood cell?

It dissociates into water and CO2 Signup and view all the answers

What is the main reason for the significant difference in chloride content between venous and arterial blood in red cells?

Chloride shift during CO2 transport Signup and view all the answers

What is the relationship between CO2 tension (PCO2) and the total CO2 content of blood according to the CO2 dissociation curve?

Direct relationship Signup and view all the answers

What is the effect of the HalDane effect at the lung with respect to CO2 content?

Decreases CO2 content in blood Signup and view all the answers

At the tissues, what happens to CO2 content when PO2 is 40mmHg and PCO2 is 46mmHg?

CO2 content increases to 52ml/dl Signup and view all the answers

What happens to Cl- as CO2 moves from RBCs into the plasma at the lung?

It moves out of RBCs into the plasma Signup and view all the answers

What is the effect on CO2 content in the absence of PO2 change according to the text?

CO2 content decreases Signup and view all the answers

How does carbonic acid dissociate at the lungs?

Into water and CO2 Signup and view all the answers

What happens to the PO2 upon entering the lungs?

It rises Signup and view all the answers

What is the consequence of the shift of the CO2 dissociation curve down?

Additional loss of CO2 Signup and view all the answers

Which type of hypoxia is due to decreased oxygen in the inspired air?

Hypoxic Hypoxia Signup and view all the answers

What does the Bohr effect involve?

Increase in CO2 and H+ levels Signup and view all the answers

What is cyanosis?

Bluish discoloration due to hypoxemia Signup and view all the answers

Which condition is characterized by tissues being unable to use oxygen?

Histotoxic Hypoxia Signup and view all the answers

Where does cyanosis typically manifest in the body?

Lips, fingers (nail bed), ear lobes and tip of nose Signup and view all the answers