Final answer:
True, employers must provide proper respirator fitting training to employees. Pathogens, inhaled carcinogens, and allergens are three things that can enter the respiratory system causing health issues such as pneumonia, lung cancer, and asthma respectively.
Step-by-step explanation:
The answer to the question is A. True. In terms of workplace safety regulations, it is a requirement that employers provide training on the proper fitting and usage of respirators to any employee who will be using them. This training ensures that workers are protected from inhaling harmful substances that could lead to occupational illnesses such as lung diseases.
As for respiratory health, there are various materials that can enter the respiratory system, potentially causing illness or injury. Here are three examples:
- Pathogens like bacteria, viruses, and fungi can cause diseases like pneumonia, tuberculosis, and aspergillosis, respectively.
- Inhaled carcinogens, such as asbestos or certain chemicals, can lead to lung cancer. There is typically a latency period before the disease manifests, making these substances particularly dangerous.
- Allergens such as pollen, dust, or pet dander can trigger allergic reactions or asthma, in which airways periodically narrow and fill with mucus.
Answering true/false questions from the reference, it is true that pneumonia can be caused by fungi, and during exhalation, the diaphragm relaxes, not contracts. Therefore, the statement 'The diaphragm contracts during exhalation' is false.