Adrenaline directly affects the heart's pacemaker (SAN) to speed up heart rate, whereas CO2 concentration affects heart rate indirectly via chemoreceptors, the brain, and subsequent signals to the heart.
La adrenalina aumenta la frecuencia cardíaca al afectar directamente el marcapasos del corazón (nodo SA), mientras que los cambios en la concentración de CO2 afectan la frecuencia cardíaca indirectamente a través de los quimiorreceptores y el cerebro, que luego envían señales al corazón.
| Front | Compare the way in which adrenaline concentration in blood affects heart rate with the way in which carbon dioxide concentration in the blood affects heart rate. |
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| Back | Hormonal vs nervous control of heart rate:
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