Other commentsSign in to post comments. You don't have an account? Sign up now!
almost 7 years ago
Why our normal heart beat ranges between 60_100 although the discharge of SA node is 105beats/min??
almost 7 years ago
Because the vagus acts as parasympathetic nerve and reduces the heart rate by opening k+ channels and closing Na+ channels.
almost 7 years ago
Because SA node is to initiate action potential fast as compare to others even av node or Purkinje fibers can initiate at slow rate because of small gap junction btw them
almost 7 years ago
I think major effects on parasympathetic(vagal) action it depressed SA node that is why SA node rate will decrease so heart rate decrease
almost 7 years ago
What are the physiological changes in exercise (changes in cardiovascular system)
