What factor would primarily increase air resistance in the lungs?AlternativesYou selected C when answering this questionThe contributor suggests B is the correct optionOPTION ALTERNATIVE FIRSTANSWERS CONFIRMEDANSWERSA Decreased surface tension1 (12.50%)1 (50.00%)B Increased bronchial smooth muscle tone3 (37.50%)1 (50.00%)C Increased compliance2 (25.00%)0 (0.00%)D Reduced mucus production1 (12.50%)0 (0.00%)E Increased production of surfactant

The factor that would primarily increase air resistance in the lungs is increased bronchial smooth muscle tone. This is because when the smooth muscle in the bronchial tubes contracts, the airways become narrower, which increases the resistance to airflow. This can be seen in conditions such as asthma, where bronchospasm (contraction of the bronchial smooth muscle) leads to increased air resistance and difficulty breathing.

Here's a step-by-step explanation:

1. The bronchial tubes are the airways that carry air into our lungs. They are lined with smooth muscle, which can contract or relax to control the diameter of the airways.

2. When the smooth muscle contracts, it causes the bronchial tubes to narrow. This is known as bronchoconstriction.

3. Bronchoconstriction increases the resistance to airflow, making it harder for air to flow into and out of the lungs. This is because the narrower the airway, the harder it is for air to flow through it.

4. Therefore, anything that causes the bronchial smooth muscle to contract (i.e., increased bronchial smooth muscle tone) will increase air resistance in the lungs.

So, the correct answer to the question is B: Increased bronchial smooth muscle tone.