Goblet cells secrete:
Correct answer: B. Mucus
- A. HCl
- B. Mucus
- C. Enzymes
- D. Amylase
Explanation
Goblet cells are unicellular glands that are present in the lining of the respiratory and digestive tracts. These cells secrete mucus, a sticky and slimy substance that helps to lubricate and protect the lining of the organs from mechanical damage and harmful pathogens. In the respiratory tract, mucus traps dust, bacteria, and other foreign particles and prevents them from entering the lungs. In the digestive tract, mucus lubricates the food bolus and facilitates its movement through the gut.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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