The nurse is reviewing the sequence of the cardiac cycle. The nurse recognizes that the electrical stimulus of the cardiac cycle follows which sequence?
AV node-SA node bundle of His- bundle branches
SA node- AV node-bundle of His -bundle branches
Bundle of His- AV node- SA node- Erb's Point
AV node-SA node-bundle of His- Erb's Point
The Correct Answer is B
A. AV node - SA node - bundle of His - bundle branches:
This sequence is incorrect. The SA node (sinoatrial node) initiates the electrical impulse in the heart, followed by the AV node (atrioventricular node), bundle of His, and then the bundle branches.
B. SA node - AV node - bundle of His - bundle branches:
This sequence is correct. The electrical stimulus of the cardiac cycle starts at the SA node, which is the natural pacemaker of the heart. From the SA node, the impulse travels to the AV node, then to the bundle of His, and finally to the bundle branches, which distribute the impulse to the ventricles, causing them to contract.
C. Bundle of His - AV node - SA node - Erb's Point:
This sequence is incorrect. Erb's Point is a point on the chest where heart sounds S2 and S3 can be heard most distinctly.
D. AV node - SA node - bundle of His - Erb's Point:
This sequence is incorrect. The AV node comes after the SA node in the electrical conduction system of the heart. Erb's Point is not a part of the normal cardiac conduction pathway; it is a location for auscultation on the chest.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Wheezing: Wheezing is a continuous, high-pitched whistling sound usually heard during expiration. It is often associated with narrowed airways, such as in asthma or chronic obstructive pulmonary disease (COPD). Wheezing occurs due to the turbulent airflow through narrowed bronchi or bronchioles and is not typically associated with pleuritis.
B. Friction rub: Pleuritis, or inflammation of the pleura, can cause a friction rub. This sound occurs when the inflamed pleural layers rub against each other during breathing. It's a grating or rubbing sound heard on auscultation and is a hallmark sign of pleuritis.
C. Stridor: Stridor is a high-pitched, harsh sound heard during inspiration and sometimes expiration. It is often a sign of upper airway obstruction, such as in croup or anaphylaxis. Stridor results from turbulent airflow through a partially obstructed or narrowed larynx or trachea.
D. Crackles: Crackles, also known as rales, are brief, discontinuous, popping sounds heard on inspiration. They can be fine or coarse and are often associated with conditions that cause fluid or secretions in the alveoli or small airways, such as pneumonia or heart failure. Crackles are not typically associated with pleuritis.
Correct Answer is ["B","C","D","E"]
Explanation
A. Age: While age itself is not modifiable, it is included in the list because aging increases the risk of developing cardiovascular disease. However, individuals cannot change their age, so it is not a modifiable risk factor.
B. Smoking: Smoking is a significant risk factor for cardiovascular disease. It damages the heart and blood vessels and can lead to atherosclerosis (narrowing and hardening of the arteries), which can result in heart attacks and strokes.
C. Hypertension: High blood pressure is a leading cause of cardiovascular disease. It can damage the arteries over time, making them more susceptible to atherosclerosis.
D. Diabetes: Diabetes, especially if poorly controlled, increases the risk of cardiovascular disease. High blood sugar levels can damage the blood vessels and the heart.
E. High cholesterol: Elevated levels of cholesterol, especially low-density lipoprotein (LDL) cholesterol, can lead to the buildup of plaque in the arteries, increasing the risk of atherosclerosis and cardiovascular events.
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