Michael Jardine
Quiz by , created more than 1 year ago

Cardiac Electrophysiology divided into two lectures: 1 - Ventricular action potential (this one) 2 - Pacemaker action potentials Outline: - During exercise, the heart increases CO (Cardiac Output) - This is achieved by increasing HR and SV (Heart Rate and Stroke Volume) - These two lectures are devoted to the electrophysiological aspects of these changes - For most of us the terminal event will be a cardiac arrhythmia...but what causes them?

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Michael Jardine
Created by Michael Jardine over 6 years ago
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PHSI3011 02-2 Cardiac Electrophysiology #1 - Ventricular action potential

Question 1 of 7

1

The Ventricular Action Potential duration is:

Select one of the following:

  • ~300 ms; ~100X longer than APs in nerves and skeletal muscle.

  • ~300 ms; roughly equal to APs in nerves and skeletal muscle.

  • ~300 ms; ~100X shorter than APs in nerves and skeletal muscle.

  • 3-4 ms; ~100X longer than APs in nerves and skeletal muscle.

  • 3-4 ms; roughly equal to APs in nerves and skeletal muscle.

  • 3-4 ms; ~100X shorter than APs in nerves and skeletal muscle.

Explanation

Question 2 of 7

1

What is ICa?

Select one of the following:

  • Intracellular [Ca]

  • Inside [Ca]

  • Inward [Ca] current

  • Intracellular [Ca], measured relative to extracellular [Ca]

Explanation

Question 3 of 7

2

There are three main functions of ICa. These are?
(select all that apply)

Select one or more of the following:

  • Provides inward current, which helps maintain long AP.

  • Provides a small fraction of the Ca, which triggers contraction.

  • Triggers Ca release from the SR (through the process of CICR - Calcium-Induced Calcium Release).

  • Helps marble meat properly.

Explanation

Question 4 of 7

1

Do Potassium channels contribute to the long action potential?

Select one of the following:

  • Yes

  • No

Explanation

Question 5 of 7

1

Potassium channels are largely responsible for which of the following?
(not necessarily their only role, though)

Select one of the following:

  • Depolarisation

  • Repolarisation

  • [none of the above]

Explanation

Question 6 of 7

1

K[ATP] channels ("ATP" should be subscript) are:

Select one of the following:

  • Potassium-induced ATP channels.

  • ATP-induced Potassium channels.

  • Lack-of-Potassium -induced ATP channels.

  • Lack-of-ATP -induced Potassium channels.

Explanation

Question 7 of 7

1

Select from the dropdown list to complete the text.

Ischaemia is ( restriction, an excess ) of blood flow

Explanation

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