Question 1 1 point An ECG is an electrical signal reflecting

Question 1 (1 point) An ECG is an electrical signal reflecting the activity of a cardiac myocytes O True False Save Question 2 (1 point) What is a primary difference between contractile cardiac myocytes and cardiac pacemaker cells? O only pacermaker cells make use of voltage-gated Ca2+ channels in the plasma membrane O only pacemaker cells have voltage-gated Na+ channels that are activated by hyperpolarization O only contractile cardiac myocytes have a rise in intracellular Ca2 O only contractile cardiac myocytes have gap junctions

Solution

1. True

3. SA node

5. QRS

6. Sarcolemma

7. True

8. QRS

9. 2R

10. False ( both increase)

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