Why does asthma often present with wheezing during exhalation?

💡 Explanation

Asthma exacerbations cause bronchoconstriction via mast cell activation and histamine release, leading to airway narrowing. Wheezing occurs because air is forced through these constricted bronchioles during exhalation. Therefore, bronchoconstriction is the main cause of wheezing, rather than alveolar tension, mucus plugging, or diaphragm fatigue.

• Why does chronic hypertension increase the likelihood of left ventricular hypertrophy even when treated with vasodilators to lower blood pressure?
• In type 2 diabetes, why does increasing circulating insulin not always effectively lower blood glucose levels, even with functioning pancreatic beta cells?
• If a demyelinating disease slows action potential propagation in a motor neuron, which consequence follows for muscle contraction?
• A patient with a hypothalamic lesion struggles to maintain a stable body temperature in varying ambient conditions. Which outcome most accurately explains why the body cannot thermoregulate effectively?
• Which consequence results when the gut's surface area is dramatically reduced?
• If a patient consistently wakes during stage 3 (slow-wave) sleep due to environmental noise, which consequence follows regarding long-term memory?