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    ​Which one is NOT a true response of pulmonary J-receptor stimulation by hyperventilation of lung?​
    Question

    Which one is NOT a true response of pulmonary J-receptor stimulation by hyperventilation of lung?

    A.

    Bronchodilatation

    B.

    Decreased heart rate

    C.

    Apnoea followed by rapid breathing

    D.

    Low blood pressure

    Correct option is A

    Explanation-

    Option a - Bronchodilation  — is the incorrect  statement.
    J-receptor stimulation does not cause bronchodilation. It is more likely to cause bronchoconstriction or no direct effect on bronchi. Bronchodilation occurs due to sympathetic (β2-receptor) stimulation — not through J-receptors.

    Option b - Decreased heart rate - Correct
    Pulmonary J (juxtacapillary) receptors, when stimulated (e.g., by pulmonary congestion or hyperinflation), activate vagal afferents. This leads to parasympathetic activation causing bradycardia (decreased heart rate).
    It is a well-established reflex in response to lung receptor stimulation.

    Option c - Apnoea followed by rapid breathing - Correct
    J-receptor stimulation initially causes apnoea (temporary cessation of breathing). This is followed by rapid, shallow breathing (tachypnea). This respiratory pattern is typical of J-receptor response and is commonly observed in pulmonary edema or hyperinflation conditions.

    Option d -  Low blood pressure - Correct
    J-receptor activation can lead to vasodilation through reflex parasympathetic activity. This causes a drop in blood pressure, especially in cases of acute pulmonary congestion. It is part of the systemic effects caused by activation of pulmonary sensory receptors.

    Since option a is the only incorrect statement that makes it a correct answer.

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