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Author Question: Which of the following cardiac cells has the slowest action potential? a. Atrial c. Purkinje ... (Read 34 times)

Jramos095

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on: Jul 16, 2018
Which of the following cardiac cells has the slowest action potential?
 
  a. Atrial c. Purkinje fiber
  b. Ventricular d. Sinoatrial node

Question 2

Electrical stimulation of a cardiac muscle cell is the definition of which of the following?
 
  a. Contraction c. Polarization
  b. Refraction d. Depolarization


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daiying98

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: D
The slope of phase 0 of the sinoatrial node (pacemaker) is less than those of the atrial, ventricular, and Purkinje fiber action potentials, and the former often is referred to as a slow action potential, whereas the latter are called fast action potentials.

Answer to Question 2

ANS: D
The action potential begins when the cell membrane of the excitable cell is exposed to a depolar-izing current and eventually reaches its excitation threshold potential. This is known as depolari-zation.


Jramos095

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Reply 2 on: Jul 16, 2018
Gracias!

atrochim

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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