What is the most likely reason that respiratory bronchioles do not have goblet c
ID: 3517867 • Letter: W
Question
What is the most likely reason that respiratory bronchioles do not have goblet cells and mucous glands in their linings?
If carbon monoxide inactivates respiratory cilia, why do smokers have more colds than non smokers?
How would a chest cold affect FEV1 and why?
If a person had a brainstem tumor whereby neurons were being destroyed and if that person manifested very long and deep inspirations, what part of the brain is being damaged?
From the information in chapter 14 alone, why would the heart of a smoker have to beat harder?
Explanation / Answer
Answer 1.Respiratory bronchioles do not have goblet cells and mucous glands in their linings because these are respiratory area and has to accommodate more air for respiration. Respiratory bronchioles also plays role in gaseous exchange. This is the reason behind absence of goblet cells and mucous glands in respiratory bronchioles.
Answer 2. Cilia is important for the conditioning of the inhaled air. Conditioning include warming the air at the body temperature. Since smoking causes production of carbonmonoxide and carbon monoxide destroy the cilia thus smoker have more colds than non smoker.
Answer 3. FEV1 is the volume of air exhaled at the end of first second of forced expiration. Cold chest decreases the FEV1 because of decrease in lung recoil property. Since cold causes restrictive lung disease, and decrease in FEV1.
Answer 4. Due to damage of the apneustic center, long and deep inspirations occur. These center is located in the pons region of the brain stem. So the pons region of the brain is being damaged.
Answer 5. The heart of smokers has to beat harder because it has to compensate the decreased partial pressure of oxygen in smokers. Smoking causes production of carbon monoxide which has more affinity for haemoglobin than that of oxygen. Thus partial pressure of oxygen decreased. That's why the heart rate of smokers are increased.
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