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dracko dracko
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6 years ago
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
Textbook 
Biological Science, Canadian Edition

Biological Science, Canadian Edition


Edition: 2nd
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GTi_NickyGTi_Nicky
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6 years ago
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dracko Author
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6 years ago
Thank you, thank you, thank you!
vanna2014
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Yesterday
This calls for a celebration Person Raising Both Hands in Celebration
paulinaibarra98
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2 hours ago
Smart ... Thanks!
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