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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The figure shows a diagrammatic view of the human respiratory system with label A, B, C and D. Select the option. Which gives correct identification and main function and /or characteristic.


  • A - trachea - long tube supported by complete cartilaginous rings for conducting inspired air.

  • B - pleural membrane - surround ribs on both sides to provide cushion against rubbing

  • C - alveoli - thin walled vascular bag - like structure for exchange of gases

  • C - alveoli - thin walled vascular bag - like structure for exchange of gases

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2.

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

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

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3.

Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.

  • Pleurisy

  • Emphysema

  • Pneumonia

  • Pneumonia

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4.
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

  • No antigen or RBC and no antibody in the plasma

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5.

Which one of the following is the correct statement for respiration in humans?

  • Cigarette smoking may lead to inflammation of bronchi 

  • Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration

  • Workers in grinding and stone-breaking industries may suffer, from lung fibrosis.

  • Workers in grinding and stone-breaking industries may suffer, from lung fibrosis.

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6.

In which one of the following processes CO2 is not released?

  • Aerobic respiration in plants

  • Aerobic respiration in animals

  • Alcoholic fermentation

  • Alcoholic fermentation

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7.

When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?

  • Falling O2 concentration

  • Rising CO2 concentration

  • Falling CO2 concentration

  • Falling CO2 concentration

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8.

Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of

  • Diaphragm

  • Neck

  • Tongue

  • Tongue

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9.

The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function.

  • A: Alveolar cavity - main site of exchange of respiratory gases

  • D: Capillary wall - exchange of O2 and CO2 takes place here

  • B : Red blood cell - transport of CO2 mainly

  • B : Red blood cell - transport of CO2 mainly

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10.

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

  • helps in releasing more O2 to the epithelial tissues

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