Nicole Geller: Attempt Question 1 (1 point) An ECG is an electrical signal refle

Question

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

Explanation / Answer

1) True- ECG results in a graph of electrical activity of the heart (cardiac) muscle as it changes over time. Cardiac muscle contracts in response to electrical depolarization of the heart muscle cells. The ECG is the measured sum, over time, of this electrical activity as it is recorded from electrode connections.

2)The pacemaker cells are connected to neighboring contractile cells via gap junctions, which enable them to locally depolarize adjacent cells.

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