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Which two factors act together to determine a person’s normal resting heart rate? I. The intrinsic rate at which Purkinje fibers generate action potentials II. The amount of acetylcholine released by the adrenal medulla III. The intrinsic rate at which the sinoatrial (SA) node generates action potentials IV. Parasympathetic input from the Vagus nerve V. The rate at which blood enters the left atrium

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Which two factors act together to determine a person’s normal resting heart rate?
I. The intrinsic rate at which Purkinje fibers generate action potentials
II. The amount of acetylcholine released by the adrenal medulla
III. The intrinsic rate at which the sinoatrial (SA) node generates action potentials
IV. Parasympathetic input from the Vagus nerve
V. The rate at which blood enters the left atrium

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  • III. The intrinsic rate at which the sinoatrial (SA) node generates action potentials
    V. The rate at which blood enters the left atrium
    Explanation:
  • normal resting heart rate ranges between 60 and 100.
  • the sinoatrial node provides impulses that allow the heart to contract and enter the left ventricle. SA node generates impulse which causes atrium to contract and pump blood into the ventricles.
  • the entry of blood into left atrium means that the left atrium have relaxed hence bringing up state of normal action of the heart
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Answered on June 25, 2020 6:21 pm
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