The Purkinje tissue cells in the heart A. Conduct impulses faster tha

1.	The Purkinje tissue cells in the heart A. Conduct impulses faster than some neurones. B. Are larger than ventricular myocardial cells. C. Lead to contraction of the base before the apex of the heart. D. Are responsible for the short duration of the QRS complex. E. Are responsible for the configuration of the QRS complex.
Answer» A. True They conduct at around 4 metres/second. Small diameter nerve fibres conduct impulses at about 1 metre per second. B. True This facilitates rapid conduction. C. False Purkinje fibres travel to the apex before proceeding to the base of the heart. D. True They spread depolarization rapidly over the entire ventricular myocardium. E. True Damage to the cells (as in bundle-branch block) changes the pattern of spread of ventricular depolarization, and hence the shape of the QRS complex.

The Purkinje tissue cells in the heart A. Conduct impulses faster than some neurones. B. Are larger than ventricular myocardial cells. C. Lead to contraction of the base before the apex of the heart. D. Are responsible for the short duration of the QRS complex. E. Are responsible for the configuration of the QRS complex.

Answer»

A. True They conduct at around 4 metres/second. Small diameter nerve fibres conduct impulses at about 1 metre per second.

B. True This facilitates rapid conduction.

C. False Purkinje fibres travel to the apex before proceeding to the base of the heart.

D. True They spread depolarization rapidly over the entire ventricular myocardium.

E. True Damage to the cells (as in bundle-branch block) changes the pattern of spread of ventricular depolarization, and hence the shape of the QRS complex.

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