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Exercise 6: Cardiovascular Physiology Ac. 2
Terms in this set (19)
Understand the role of sympathetic and parasympathetic nervous system on heart activity
Consequences of vagal stimulation and vagal escape
functionality of the sinoatrial node
fight or flight
increases the rate and force of contraction of the heart.
rest and digest
decreases the heart rate without directly changing the force of contraction.
Vagus (CN X) Nerve
carries signal to the heart
resumption of the heartbeat.
can be result of sympathetic reflexes or initiation of a rhythm by the Purkinje fibers.
Sinoatrial Node (SA Node)
cluster of autorhythmic cardiac cells found on the right atrial wall of the heart.
fastest rate of spontaneous depolarization which determines the heart rate
Absence of Parasympathetic stimulation, Sympathetic stimulation and hormonal controls...
the SA node generates action potentials 100 times per minute.
The effect of the parasympathetic nervous system on the heart is to...
decrease heart rate (not force of contraction)
The branch of the ANS that dominates during exercise is...
the sympathetic branch
Parasympathetic stimulation reaches the heart through...
vagus nerves, which are cranial nerves
The usual pacemaker of the heart...
is the sinoatrial node
The vagus nerve carries...
signals that decrease the heart rate
The response that resumed the heartbeat after the vagus nerve stimulation is called...
Extreme vagus nerve stimulation affects the heart by...
stopping the heart completely
Vagal escape probably involves....
Absence of neural and hormonal influences, the SA node generates action potentials up to 100 times per minute. At rest, heart rate is around 70 bpm which suggests that...
the parasympathetic nervous system has more control over heart rate.
The SA node in the human heart is located...
in the right atrium
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