PHSI3011 02-2 Cardiac Electrophysiology #1 - Ventricular action potential

Question 1

The Ventricular Action Potential duration is:

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Answer

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

Answer

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

Question 2

What is ICa?

Accepted Answer

Inward [Ca] current

Answer

Intracellular [Ca]

Answer

Inside [Ca]

Answer

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

Question 3

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

Accepted Answer

Provides inward current, which helps maintain long AP.

Accepted Answer

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

Accepted Answer

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

Answer

Helps marble meat properly.

Question 4

Do Potassium channels contribute to the long action potential?

Accepted Answer

Yes

Answer

No

Question 5

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

Accepted Answer

Repolarisation

Answer

Depolarisation

Answer

[none of the above]

Question 6

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

Accepted Answer

Lack-of-ATP -induced Potassium channels.

Answer

Potassium-induced ATP channels.

Answer

ATP-induced Potassium channels.

Answer

Lack-of-Potassium -induced ATP channels.

Question 7

Ischaemia is [blank_start]____[blank_end] of blood flow

Accepted Answer

restriction

Answer

an excess

Perguntas do quiz (7)