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Ch. 11 Cardiovascular System
Marieb - Essentials of Human Anatomy & Physiology 13th Edition
Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Marieb 13th EditionCh. 11 Cardiovascular System문제 5
11장, 문제 5

More than one choice may apply.
Atrial repolarization coincides in time with the
a. P wave
b. T wave
c. QRS wave
d. P-Q interval

검증된 단계별 안내
1
Understand the concept of atrial repolarization: Atrial repolarization is the process by which the atria return to their resting electrical state after depolarization. This occurs after the atria have contracted and is typically masked by other electrical events in the heart.
Review the components of an electrocardiogram (ECG): The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. The P-Q interval is the time between the start of atrial depolarization and the start of ventricular depolarization.
Recognize that atrial repolarization is not directly visible on an ECG: Atrial repolarization coincides with the QRS complex, which represents ventricular depolarization. The electrical activity of atrial repolarization is overshadowed by the larger electrical signal of the QRS complex.
Eliminate incorrect options: The P wave represents atrial depolarization, not repolarization. The T wave represents ventricular repolarization, not atrial repolarization. The P-Q interval is a time measurement and does not directly represent atrial repolarization.
Conclude that atrial repolarization coincides with the QRS wave: This is because the electrical activity of atrial repolarization occurs simultaneously with ventricular depolarization, which is represented by the QRS complex.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Atrial Repolarization

Atrial repolarization refers to the process by which the atria of the heart recover from depolarization after contraction. This electrical event is not typically visible on an electrocardiogram (ECG) as a distinct wave, but it occurs during the QRS complex, which represents ventricular depolarization.
추천 영상:
가이드 코스
9:24
Electrocardiogram: Pathologies

Electrocardiogram (ECG) Waves

An electrocardiogram (ECG) displays the electrical activity of the heart through various waves: the P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. Understanding these waves is crucial for interpreting cardiac function and identifying abnormalities.
추천 영상:
가이드 코스
4:36
Electrocardiogram (ECG) Example 2

QRS Complex

The QRS complex is a key component of the ECG that reflects the rapid depolarization of the ventricles. It typically masks the atrial repolarization, which occurs simultaneously, making it important to recognize that while atrial repolarization happens during this time, it is not represented as a separate wave on the ECG.
추천 영상:
2:31
Major Histocompatibility Complexes
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교과서 질문

More than one choice may apply.

Soon after the onset of ventricular systole, the

a. AV valves close.

b. semilunar valves open.

c. first heart sound is heard.

d. aortic pressure increases.

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교과서 질문

In comparing a parallel artery and vein, you would find that


a. The artery wall is thicker

b. The artery diameter is greater

c. The artery lumen is smaller

d. The artery endothelium is thicker

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교과서 질문

More than one choice may apply.

Given a volume of 150 ml at the end of diastole, a volume of 50 ml at the end of systole, and a heart rate of 60 bpm, the cardiac output is

a. 600 ml/min

b. 6 liters/min

c. 1200 ml/min

d. 3 liters/min

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교과서 질문

More than one choice may apply.

Which of the following depolarizes next after the AV node?

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1
rank
교과서 질문

More than one choice may apply.

Which of these vessels is bilaterally symmetrical (i.e., one vessel of the pair occurs on each side of the body)?

a. Internal carotid artery

b. Brachiocephalic trunk

c. Azygos vein

d. Renal vein

1123
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교과서 질문

More than one choice may apply.

During atrial systole,

a. The atrial pressure exceeds ventricular pressure.

b. 70 percent of ventricular filling occurs.

c. The AV valves are open.

d. Valves prevent backflow into the great veins.

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