Q:

The Purkinje tissue cells in the heart

safaTerkawi
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2022-08-07
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 The Purkinje tissue cells in the heart.

  1. Conduct impulses faster than some neurones.
  2. Are larger than ventricular myocardial cells.
  3. Lead to contraction of the base before the apex of the heart.
  4. Are responsible for the short duration of the QRS complex.
  5. Are responsible for the configuration of the QRS complex.
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safaTerkawi
2022-08-07
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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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