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A&P 2 Module 3 Exam - Portage Learning Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

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A&P 2 Module 3 Exam - Portage Learning Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What muscular layer of the heart wall is responsible for contraction? Myocardium What layer of the heart lines the inner surface of the chambers? Endocardium What is the outer protective layer of the heart called? Epicardium What is the name of the sac that surrounds and protects the heart? Pericardium What is the name of the small space between the pericardial layers? Pericardial cavity 2 What fluid reduces friction between the heart and the pericardium? Pericardial fluid What node initiates the electrical impulse that causes the heart to contract? SA node What is the heart’s natural pacemaker? Sinoatrial node What part of the conduction system delays the impulse before it reaches the ventricles? AV node What structure carries impulses from the AV node to the ventricles? Bundle of His What fibers spread the impulse throughout the ventricles? Purkinje fibers

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  • ap 2 module 3 exam portage learning questions a

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A&P 2 Module 3 Exam - Portage
Learning Questions and Answers |
Latest Version | 2025/2026 | Correct &
Verified
What muscular layer of the heart wall is responsible for contraction?


✔✔ Myocardium




What layer of the heart lines the inner surface of the chambers?


✔✔ Endocardium




What is the outer protective layer of the heart called?


✔✔ Epicardium




What is the name of the sac that surrounds and protects the heart?


✔✔ Pericardium




What is the name of the small space between the pericardial layers?


✔✔ Pericardial cavity


1

,What fluid reduces friction between the heart and the pericardium?


✔✔ Pericardial fluid




What node initiates the electrical impulse that causes the heart to contract?


✔✔ SA node




What is the heart’s natural pacemaker?


✔✔ Sinoatrial node




What part of the conduction system delays the impulse before it reaches the ventricles?


✔✔ AV node




What structure carries impulses from the AV node to the ventricles?


✔✔ Bundle of His




What fibers spread the impulse throughout the ventricles?


✔✔ Purkinje fibers

2

, What term describes contraction of the heart chambers?


✔✔ Systole




What term describes relaxation of the heart chambers?


✔✔ Diastole




What sound is produced by the closing of the AV valves?


✔✔ Lub




What sound is produced by the closing of the semilunar valves?


✔✔ Dub




What valve opens during right ventricular contraction?


✔✔ Pulmonary semilunar valve




What valve opens during left ventricular contraction?


✔✔ Aortic semilunar valve

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