Which of the Following Mechanisms Play a Role in Regulating

question 18

Multiple Choice

Which of the following mechanisms play a role in regulating heart rate?
Which of the following mechanisms play a role in regulating heart rate?

• A) chemical messengers in the blood, such as epinephrine
• B) nerves originating from the medulla lower part of the brain)
• C) pacemaker cells within the heart
• D) all of the above A to C)
• E) only A and C

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