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  1. The rate of heartbeat is accelerated by the hormone

    2. A.

     Adrenaline
    B.

     Acetylcholine
    C.

     Thyroxine
    D.

     Pituitrin

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    Answer : Option A

    Explanation :

    The rate of heartbeat is accelerated by the hormone. The hormone adrenaline also called epinephrine is known as a stress hormone. In emotional upsets( like fear, anger etc.) this hormone is poured into the blood and it accelerates heart beat.

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