Why does bronchoconstriction occur during an asthma attack despite normal atmospheric oxygen?

💡 Explanation

During an asthma attack, mast cells release histamine, which triggers smooth muscle contraction in the bronchioles, reducing airflow and causing bronchoconstriction. This occurs because histamine increases intracellular calcium, leading to constriction, therefore airways narrow despite sufficient oxygen, rather than impaired gas exchange or hemoglobin function.

• Which consequence results when tubular flow exceeds transport maximum?
• Which consequence results when thermal denaturation damages gustatory receptors?
• During chronic pain management, which process explains why stimulating A-beta fibers can reduce pain sensation in a patient with peripheral neuropathy?
• If an experimental influenza vaccine containing hemagglutinin antigen shows a weak antibody response in initial trials, which consequence follows from adding an appropriate adjuvant?
• If a pharmaceutical company aims to reduce inflammation by targeting the NF-κB signaling pathway, which consequence involving cytokine production is most likely?
• Why does amenorrhea (absence of menstruation) sometimes occur in the luteal phase, despite normal estrogen levels earlier in the cycle?