-Searc es/741874/quizzes/1694606/take iz 2 IvyTech Fall17 X D Question 13 0.5 pt

Question

-Searc es/741874/quizzes/1694606/take iz 2 IvyTech Fall17 X D Question 13 0.5 pts What is the functional significance of large areas of cardiac muscle being electrically coupled to form a single functional syncytium? O Because they form a syncytium cardiac muscles can contract on their own O Because they form a syncytium musde cells can pass an action potential along a large area of the heart wall, stimulating contraction in each muscle fiber of the syncytium not fatigue bundles contracting both atrial chambers. Because they form a synytium, musde cells canot summa te contraction to produce tetanus and thus O Because they form a syncytium, cardiac muscle cells can pass an action potential by way of intemodal D Question 14 0.5 pts Which of the following most accurately describes what is measured by an electrocardiogram? O Electrical conductivity O Number of contractions per minute O The speed and strength of

Explanation / Answer

What is the functional significance of large areas of cardiac muscle being electrically coupled to form a single functional syncytium?

Ans. Because they form a syncytium, muscle cells can pass an action potential along a large area of the heart wall, stimuating contraction in each muscle fiber of the syncytium.

Which of the following accurately describes what is measured by an electrocardiogram?

Ans. Electrical conductivity

It can be measured by placing electrodes on the skin. Electrocardiogram can measure the rate and rhythm of the heartbeat and it also provides an indirect evidence of blood flow to the heart muscle.

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