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PHSI3011 02-2 Cardiac Electrophysiology #1 - Ventricular action potential
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Questions in this quiz (7)
1The Ventricular Action Potential duration is:
- A~300 ms; ~100X longer than APs in nerves and skeletal muscle.
- B~300 ms; roughly equal to APs in nerves and skeletal muscle.
- C~300 ms; ~100X shorter than APs in nerves and skeletal muscle.
- D3-4 ms; ~100X longer than APs in nerves and skeletal muscle.
- E3-4 ms; roughly equal to APs in nerves and skeletal muscle.
- F3-4 ms; ~100X shorter than APs in nerves and skeletal muscle.
2What is ICa?
- AIntracellular [Ca]
- BInside [Ca]
- CInward [Ca] current
- DIntracellular [Ca], measured relative to extracellular [Ca]
3There are three main functions of ICa. These are?
(select all that apply)- AProvides inward current, which helps maintain long AP.
- BProvides a small fraction of the Ca, which triggers contraction.
- CTriggers Ca release from the SR (through the process of CICR - Calcium-Induced Calcium Release).
- DHelps marble meat properly.
4Do Potassium channels contribute to the long action potential?
- AYes
- BNo
5Potassium channels are largely responsible for which of the following?
(not necessarily their only role, though)- ADepolarisation
- BRepolarisation
- C[none of the above]
6K[ATP] channels ("ATP" should be subscript) are:
- APotassium-induced ATP channels.
- BATP-induced Potassium channels.
- CLack-of-Potassium -induced ATP channels.
- DLack-of-ATP -induced Potassium channels.
7Ischaemia is [blank_start]____[blank_end] of blood flow
- Arestriction
- Ban excess
Information
- Description
- 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?
- Author
- Michael Jardine
- Language
- English
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