Question

Identify the parts labelled 1-8 in the diagram given below.

• A. 1. Nasal passage, 2. Pharynx, 3. Trachea, 4. Lungs, 5. Bronchi, 6. Bronchioles, 7. Alveoli, 8. Diaphragm
• B. 1. Nasal passage, 2. Pharynx, 3. Lungs, 4. Bronchi, 5. Bronchioles, 6. Diaphragm, 7. Alveoli, 8. Trachea
• C. 1. Nasal passage, 2. Trachea, 3. Pharynx, 4. Lungs, 5. Bronchioles, 6. Bronchi, 7. Alveoli, 8. Diaphragm
• D. 1. Nasal passage, 2. Pharynx, 3. Trachea, 4. Lungs, 5. Bronchi, 6. Alveoli, 7. Bronchioles, 8. Diaphragm

Answer 1

The correct option is A 1. Nasal passage, 2. Pharynx, 3. Trachea, 4. Lungs, 5. Bronchi, 6. Bronchioles, 7. Alveoli, 8. Diaphragm

• Human respiratory system consists of respiratory tract and respiratory organs.
• Respiratory tract consists of nose, pharynx, larynx, trachea and the primary bronchi. A pair of lungs on either side of heart in the thoracic cavity are the respiratory organs.
• At its lower end, the trachea bifurcates into a pair of primary bronchi which enters the right and left lungs. The left and right bronchi further branches off into smaller secondary bronchi and then into many smaller tertiary bronchi.
• They continue branching and finally, tiny terminal bronchioles develop which conduct air to the alveoli of the lungs.
• Diaphragm is a dome-shaped muscular partition separating the thorax from the abdomen. It contributes in breathing by expanding and contracting the thoracic cavity and consequently, the lungs.