Answer the following question: Q: A more crucial use of rc circuits for timing purposes is in the artificial pacemaker, used to control what? Read this paragraph and choose the correct option from the provided answers: A more crucial use of RC circuits for timing purposes is in the artificial pacemaker, used to control heart rate. The heart rate is normally controlled by electrical signals generated by the sino-atrial (SA) node, which is on the wall of the right atrium chamber. This causes the muscles to contract and pump blood. Sometimes the heart rhythm is abnormal and the heartbeat is too high or too low. The artificial pacemaker is inserted near the heart to provide electrical signals to the heart when needed with the appropriate time constant. Pacemakers have sensors that detect body motion and breathing to increase the heart rate during exercise to meet the body's increased needs for blood and oxygen. Choices: - breathing rate - blood pressure - iron levels - heart rate A:
Answer:
heart rate