Experiments performed by Otto Loewi on the vagus nerve and heart of a frog showed that the vagus nerve releases a neurotransmitter that causes the heart to slow down. Which of the following statements describes the effects of this neurotransmitter on the heart?

+3 votes

 

  

It causes an increase in the rate at which action potentials can be generated in the heart muscle.

  

It causes voltage-gated sodium channels in the heart muscle to become more sensitive to changes in voltage.

  

It causes a decrease in the rate at which action potentials can be generated in the heart muscle.

  

It causes voltage-gated sodium channels in the heart muscle to open more quickly.

 

asked Dec 31, 2012 in Biology by anonymous
    

1 Answer

+1 vote

 

It causes a decrease in the rate at which action potentials can be generated in the heart muscle.

 

answered Dec 31, 2012 by Luffy ~Expert~ (977 points)

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