heart structure and function

Question 1

what are the pacemakers of the heart

Answer 1

1. SA node (pacemaker)
2. AV node
3. AV bundle (bundle of his)
4. Bundle branches
5. Purkinje fibers

Question 2

What percentage of cardiac muscle cells are autorhythmic rather than contractile?

Answer 2

1%

Question 3

BPM of SA node?

Answer 3

70-80/min

Question 4

BPM AV node

Answer 4

40-60/min

Question 5

BPM Purkinje fibers

Answer 5

20-40/min