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Breathing and Exchange of Gases

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Question
CBSEENBI11002228
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Person with blood group AB is considered as universal recipient because he has

  • Both A and B antigens on RBC but no antibodies in the plasma

  • Both A and B antibodies in the plasma

  • No antigen or RBC and no antibody in the plasma

  • Both A and B antigens in the plasma but no antibodies

Solution

A.

Both A and B antigens on RBC but no antibodies in the plasma

Blood group AB is universal recipient because the person with AB blood group has both A and B antigens or RBC but no antibodies in the plasma. Other blood groups and their genotypes are

Blood Group

Antigen(s) Present on the RBC

Antibodies Present in Serum

Genotypes

A

Antigen – A

Anti – b

AA/AQ

B

Antigen –B

Anti – a

BB/BO

C

None

Anti – a and b

O

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Question
CBSEENBI11002354
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A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissue. This O2

  • Raise the pCO2 of blood 75 mm of Hg.

  • Is enough to keep oxyhaemoglobin

  • helps in releasing more O2 to the epithelial tissues

  • acts as a reserve during muscular exercises

Solution

D.

acts as a reserve during muscular exercises

Our tissue is able to utilise only 25% of O2 carried by the arterial blood. The venous blood is still 75% saturated with O2. This O2 acts as a reserve during muscular exercise.

Question
CBSEENBI11002499
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Aerobic respiratory pathway is appropriately termed

  • catabolic

  • parabolic

  • amphibolic

  • anabolic

Solution

C.

amphibolic

An amphibolic pathway is a biochemical pathway that serves both anabolic and catabolic processes. An important example of an amphibolic pathway is the Kerbs cycle, which involves both the catabolism of carbohydrates and fatty acid and the synthesis, eg alpha-ketoglutarate and oxaloacetate. 

Question
CBSEENBI11002391
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Bulk of carbon dioxide (CO2) released from body tissue into the blood is present as 

  • bicarbonate in blood plasma and RBCs

  • free CO2 in blood plasma

  • 70% carbamino - haemoglobin and 30% as bicarbonate

  • carbamino - haemoglobin in RBCs

Solution

A.

bicarbonate in blood plasma and RBCs

70-75% of CO2 is transported as sodium bicarbonate (NaHCO3) by plasma, and as potassium bicarbonate (KHCO3) by RBCs.

Question
CBSEENBI11002118
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Figure shows schematic plan of blood circulation in human with labels  A to D. Identify to label and give its function/s


  • A - pulmonary vein - takes impure blood from body parts,pO2 = 60 mmHg

  • B - pulmonary artery - takes blood from heart to lungs, pO2 = 90 mmHg

  • C - vena cava - takes blood from body parts to right auricle, pCO2 = 45 mmHg

  • D - dorsal aorta -takes blood from heart to body parts, pO2 = 95 mmHg

Solution

C.

C - vena cava - takes blood from body parts to right auricle, pCO2 = 45 mmHg

A -  pulmonary vein takes impure blood from body part, pO2 = 60 mmHg
B - Pulmonary artery - takes blood from heart to lungs, pO2 = mmHg
C- Vena cava -takes blood from body parts to right auricle, pCO2 = 45 mm Hg
D- Dorsal aorta takes blood from heart to body parts, pO2 = 95 mm Hg

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