13 points!
Which of the following is a group of cells that sends signals to control the heart rate?

Atrium
Pacemaker
Septum
Valve

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peterblessd6868

24.11.2021

Chemistry

Since phosphoric acid is H3PO4, which is known from PO4, with a charge of 3- so 3 hydrogen would balance it out, and sodium hydroxide is NaOH, it can be assumed that it results in H3(OH)3 + Na3PO4.

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13 points! Which of the following is a group of cells that sends signals to control the heart rate? Atrium Pacemaker Septum Valve