How many external nostrils are present in human beings
1. 1
2. 2
3. 3
4. None of these

Nasopharynx opens through_________ of the larynx region into the trachea.
1. glottis
2. gullet
3. epiglottis
4. All of these

Which of the following is true about epiglottis
1. thin elastic cartilaginous flap
2. prevent food entry into larynx
3. Coughing occurs due to its improper movement
4. All of these

The common passage for food and air is
1. nasal passage
2. nasopharynx
3. oropharynx
4. pharynx

Which of the following is not supported by cartilaginous rings
1. Primary bronchioles
2. tertiary bronchioles
3. tracheae
4. alveoli

Which of the following comprise the lungs
1. tracheae along with network of bronchi, bronchioles and alveoli
2. network of bronchi, bronchioles and alveoli
3. alveoli only
4. Both A and B

Lungs are covered by a double layered membrane which is called
1. Pleural membrane
2. visceral membrane
3. pulmonary membrane
4. parietal membrane

Which of the following is true about pleural membranes except
1. outer pleural membrane is in close contact with the thoracic lining
2. inner pleural membrane is in contact with the lung surface
3. pleural fluid is present between them
4. It increases friction on the lung surface

Which of the following constitute the conduction part of the respiratory system
1. external nostrils to trachea
2. external nostrils to primary bronchioles
3. Respiratory bronchioles to alveoli
4. external nostrils to terminal bronchioles

Which of the following constitute the exchanging part of the respiratory system
1. external nostrils to trachea
2. external nostrils to primary bronchioles
3. Respiratory bronchioles to alveoli
4. external nostrils to terminal bronchioles