Cardiovascular System 3, Heart, electrical system

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2015-08-04に共有
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The electrical activity for the contraction of the heart is initiated by the:
a. sinoatrial node 
b. atrioventircular node
c. medulla oblongata
d. myocytes

The only point of electrical conduction between the atria and the ventricles is provided by the;
a. Sinoatrial node
b. Atrioventricular node
c. Atrioventricular bundle 
d. Purkinje fibres

The electrical impulses from the atrial myocardium are collected by the
a. Sinoatrial node
b. Atrioventricular node   
c. Atrioventricular bundle
d. Purkinje fibres

Sympathetic stimulation of the heart will 
a. Increase heart rate 
b. Reduce heart rate
c. Have no effect on heart rate
d. Reduce stroke volume

Parasympathetic stimulation of the heart is provided via the;
a. Phrenic nerves
b. Thoracic spinal nerves
c. Cervical spinal nerves
d. Vagus nerve

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  • I can't thank you enough! I have never been able to properly understand the electrical conduction in the heart, until today.
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  • Dr. John Campbell your videos are so amazing !!!! you explain concepts so clearly !!!! I honestly used to HATE to study about the heart but thanks to you and your amazing videos I now find studying about the heart so interesting!!!!! Thank you so so so so so so much. Please keep making amazing videos like this. Much appreciation and gratitude. xx
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  • @lberry750
    This was the best explanation of the cardiac electrical system I’ve heard. Thank you, Dr. Campbell.
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