How come breathing in during inspiration is not affected by bronchoconstriction (asthma/copd)?

Negative pressure. When you breathe in, your chest wall and diaphragm expand and create decreased pressure in your lungs. Because the bronchoconstriction is also inside your lungs, the negative pressure causes the airway to expand as well, and air flows in easily. When you breathe out, the chest wall and diaphragm relax, and pressure in the lungs increases. This snaps the airways closed again, like a valve.

Related Questions

Why is breathing in during inspiration not affected by bronchoconstriction (asthma/copd)? I need some advice.

Bronchoconstriction. Lung disease is defined as either restricted or obstructed. Bronchoconstriction is, by definition, an obstructed condition. Obstructed diseases limit the ability to exhale air out of the lungs. Asthma and COPD are examples of diseases that lead to airway obstruction, where exhalation is affected, not inhalation. Read more...

Why is breathing in during inspiration not affected by bronchoconstriction (asthma or copd)?

Pressure. Long story...essentially, the pressure pushing upon the airways with expiration causes the airways to close upon themselves, causing air trapping which is one of the hallmarks of COPD and the other obstructive lung diseases. Read more...

Bronchoconstriction (asthma/copd) affects breathing out during expiration, but not breathing in during inspiration, how come?

Dynamic collapse. This is a fancy term of when airway pressure is more on the outside of your airways and collapses as you exhale. This pressure difference happens at different stages of exhalation in copd. With asthma there is narrowing of your airways from inflammation so this constricts the diameter and makes this worse. All due to airway pressure and "equal pressure point". Hope this helps! Read more...

I have bronchoconstriction (asthma/copd) affects breathing out during expiration, but not breathing in during inspiration. Why, what to do?

Bronchodilators. To improve the flow of air you need to use bronchodilators which open the airways and allow the air to pass through more easily. There are many inhalers that could help and a consultation with your pulmonologist may be a good option to help with finding the right balance of therapy. Read more...
Typical symptoms. This is a common symptoms for those with airway obstruction be it from asthma or copd. You need to get an assessment to determine what kind of medications may relieve your symptoms. Inhaled steroid, inhaled bronchodilator, and inhaled anticholinergic are the most common drugs used in your condition. Most of these drugs need to be used regularly. Read more...