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