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Home Q & A Board Biology-Related Homework Help General Biology
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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
Authors:
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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
This helped my grade so much Perfect
mikeh209
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Yesterday
this is exactly what I needed
Marcie D
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2 hours ago
Smart ... Thanks!
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