The Heart Rate Speeds Up or Slows Down Because the

question 56

Multiple Choice

The heart rate speeds up or slows down because the

• A) AV node detects lower levels of oxygen and sends faster signals to the SA node.
• B) brain consciously detects the need for more oxygen and intentionally stimulates the heart.
• C) medulla oblongata, through the autonomic system, stimulates or depresses heart rate based on activity and stress.
• D) hormone epinephrine inhibits the heartbeat.
• E) SA node detects lower levels of oxygen and sends faster signals to the AV node.

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