Physio Ex 6 #2
The usual pacemaker of the heart
is the sinoatrial node
Extreme vagus nerve stimulation affects the heart by
stopping the heart completely
Vagal escape probably involves
sympathetic reflexes
Research shows that, in the absence of neural and hormonal influences, the SA node generates action potentials at a frequency of approximately 100 times per minute. However, the resting heart rate is approximately 70 beats per minute, which suggests that
the parasympathetic nervous system has more control over heart rate
the branch of the autonomic nervous system that dominates during exercise is
the sympathetic branch
The response that resumed the heartbeat after the vagus nerve stimulation is called
vagal escape
Parasympathetic stimulation reaches the heart through
vagus nerves, which are cranial nerves
effect of parasympathetic nervous system on heart
decreases heart rate
The SA (sinoatrial) node in the human heart is located
in the right atrium
The vagus nerve carries
signals that decrease the heart rate