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

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

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

• 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

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.

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

• Aerobic respiration in plants

• Aerobic respiration in animals

• Alcoholic fermentation

• Alcoholic fermentation

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

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

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

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

• Raise the p_CO2 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