Conduction

Question 1

Where does conduction begin?

Answer 1

SA node (Pacemaker)

Question 2

What speeds or slows this rate?

Answer 2

Slows - Vagus

Speeds - Cardiac nerves

Question 3

What is the process of pacemaker cell depolarisation?

Answer 3

• 4 - Permeable to Na so move in to -40. These are never really resting so called funny channels
• 0 - this change opens VGCC so Ca comes in and causes depolarisation
• 3 - At 10mv these clse and VGKC open and this flow in to lower it again

Question 4

Pacemaker cell depolarisation on a graph

Answer 4

Question 5

What is the process of normal myocyte cell depolarisation?

Answer 5

4 - Resting. K open so it leaves

0 - Depolarisation and VGNC open so it rushes in

1 - VGNC close and VGKN open so K rushes in to lower potential

2 - VGCC open to slow fall

4 - VGCC close to fall goes again until these close and it starts again

Question 6

Myocyte depolarisation in graph form

Answer 6