CVS Lecture 5

Question 1 of 8

1

Which of the following statements are false

Select one or more of the following:

Membrane permeability to Ca2+ is very high
The membrane is not very permeable to K+ ions
Permeability to Na+ is 20% that for K+
The ease with which the ion passes through the membrane is referred to as conductivity (C)
If the conductance for an ion increases, the ion will pass through the membrane and a current will flow

Explanation

Question 2 of 8

1

Click on each orange point and write the correct answer.

Fill in the blanks with positive and negative

Explanation

Question 3 of 8

1

Which of the following statements are true?

Select one or more of the following:

The resting membrane potential in contractile cells of the atria and ventricles is about -70mV
The inside of the cell is positively charged in relation to the outside of the cell
The resting membrane potential is primarily due to two
things; the high concentration of potassium ions in the intracellular fluid and the high permeability of the cell membrane K+ ions as compared to other ions
The resting membrane potential is close to the equilibrium potential for sodium

Explanation

Question 4 of 8

1

Click on each orange point and write the correct answer.

Label the following image 0-4

Explanation

Question 5 of 8

1

Which of the following are the events of phase 0 - upstroke

Select one or more of the following:

Potential reaches threshold: –65 mV
Membrane’s ionic permeability suddenly changes
Cell rapidly depolarises and over shoots to a positive potential of +40mV
At the threshold potential, voltage sensitive potassium channels open very quickly

Explanation

Question 6 of 8

1

Fill the blank space to complete the text.

The membrane potential does not reach the equilibrium potential of sodium because the outward current is still flowing

Explanation

Question 7 of 8

1

In early repolarisation why is the overshoot brief?

Select one of the following:

Fast sodium channels that are self inactivating decreases conductance of sodium
Fast potassium channels that are self inactivating decrease conductance of potassium
Voltage sensitive sodium channels quickly close
Voltage sensitive potassium channels quickly close

Explanation

Question 8 of 8

1

Within a couple of milliseconds the membrane voltage repolarises a few mV, owing to an outward current of

Select one of the following:

Calcium ions
potassium ions
sodium ions

	Created by Rachel O' Flynn about 6 years ago

1st year college CVS Physiology Quiz on CVS Lecture 5, created by Rachel O' Flynn on 25/02/2018.

CVS Lecture 5

Question 1 of 8

Which of the following statements are false

Select one or more of the following:

Explanation

Question 2 of 8

Click on each orange point and write the correct answer.

Fill in the blanks with positive and negative

Explanation

Question 3 of 8

Which of the following statements are true?

Select one or more of the following:

Explanation

Question 4 of 8

Click on each orange point and write the correct answer.

Label the following image 0-4

Explanation

Question 5 of 8

Which of the following are the events of phase 0 - upstroke

Select one or more of the following:

Explanation

Question 6 of 8

Fill the blank space to complete the text.

The membrane potential does not reach the equilibrium potential of sodium because the outward current is still flowing

Explanation

Question 7 of 8

In early repolarisation why is the overshoot brief?

Select one of the following:

Explanation

Question 8 of 8

Within a couple of milliseconds the membrane voltage repolarises a few mV, owing to an outward current of

Select one of the following:

Explanation