A nurse is describing the process by which blood is ejected into circulation as the chambers of the heart become smaller.
How does the nurse categorize this action of the heart?

Repolarization

Systole

Diastole

Ejection fraction

Answer and Explanation

The Correct Answer is B

Choice A Rationale:

Repolarization is a phase in the cardiac cycle that involves the restoration of electrical charges in heart muscle cells, enabling them to prepare for the next contraction. It does not directly refer to the physical contraction and ejection of blood from the chambers.

During repolarization, the heart muscle cells regain their negative electrical charge after depolarization, which triggered the contraction.

Repolarization is essential for maintaining the heart's rhythmic electrical activity and ensuring coordinated contractions.

It does not, however, cause the chambers to become smaller and eject blood, which is the defining feature of systole.

Choice C Rationale:

Diastole is the phase of the cardiac cycle when the heart chambers relax and fill with blood. It is the opposite of systole.

During diastole, the heart muscle relaxes, allowing the chambers to passively expand and collect blood from the veins.

The atrioventricular valves (mitral and tricuspid valves) open during diastole, allowing blood to flow from the atria into the ventricles.

While diastole is crucial for ensuring adequate blood supply to the heart, it does not involve the forceful ejection of blood into circulation that characterizes systole.

Choice D Rationale:

Ejection fraction is a measurement of the heart's pumping efficiency. It represents the percentage of blood that is ejected from the left ventricle with each contraction.

A normal ejection fraction is typically between 55% and 70%.

While ejection fraction is related to systole, it is not a synonym for it. Ejection fraction is a quantitative measure of how well the heart is pumping, while systole refers to the specific phase of the cardiac cycle when contraction and ejection occur.

Nursing Test Bank

Quiz #1: RN Exams Pharmacology Exams Quiz #2: RN Exams Medical-Surgical Exams Quiz #3: RN Exams Fundamentals Exams Quiz #4: RN Exams Maternal-Newborn Exams Quiz #5: RN Exams Anatomy and Physiology Exams Quiz #6: RN Exams Obstetrics and Pediatrics Exams Quiz #7: RN Exams Fluid and Electrolytes Exams Quiz #8: RN Exams Community Health Exams Quiz #9: RN Exams Promoting Health across the lifespan Exams Quiz #10: RN Exams Multidimensional care Exams

Get 100+ Naxlex Exit Exams for $79 Try Naxlex NCLEX-RN (14 Day Free-Trial)

Naxlex Comprehensive Predictor Exams

Quiz #1: Naxlex RN Comprehensive online practice 2019 B with NGN Quiz #2: Naxlex RN Comprehensive Predictor 2023 Quiz #3: Naxlex RN Comprehensive Predictor 2023 Exit Exam A Quiz #4: Naxlex HESI Exit LPN Exam Quiz #5: Naxlex PN Comprehensive Predictor PN 2020 Quiz #6: Naxlex VATI PN Comprehensive Predictor 2020 Quiz #8: Naxlex PN Comprehensive Predictor 2023 - Exam 1 Quiz #10: Naxlex HESI PN Exit exam Quiz #11: Naxlex HESI PN EXIT Exam 2

Free Nursing Study Resources

Correct Answer is ["C","D"]

Explanation

Choice A rationale:

The ST segment represents the period of time between ventricular depolarization and repolarization. Its elevation or depression can indicate myocardial ischemia or injury, but it's not directly related to normal sinus rhythm determination.

The PR interval, on the other hand, measures the time it takes for the electrical impulse to travel from the atria to the ventricles. While a normal PR interval is essential for normal sinus rhythm, its height relative to the ST segment is not a determining factor.

Choice B rationale:

The number of complexes in a 6-second strip can provide a quick estimate of heart rate, but it's not a definitive criterion for normal sinus rhythm. A normal heart rate in adults typically ranges from 60 to 100 beats per minute, which could correspond to 5-10 complexes in a 6-second strip. However, other factors, such as rhythm regularity and P wave morphology, must also be considered. Choice C rationale:

RR intervals that are relatively consistent are a hallmark of normal sinus rhythm. This indicates that the heart is beating at a regular pace, with equal time intervals between each QRS complex. In contrast, irregular RR intervals suggest dysrhythmia, such as atrial fibrillation or premature ventricular contractions.

Choice D rationale:

One P wave preceding each QRS complex is another essential feature of normal sinus rhythm. The P wave represents atrial depolarization, and its consistent presence before each QRS complex (which represents ventricular depolarization) indicates that the electrical impulse is originating in the sinoatrial (SA) node, the heart's natural pacemaker, and is propagating through the atria and ventricles in a coordinated manner.

A. The increased LDL will decrease the amount of cholesterol deposited on the artery walls. B. Increased LDL and decreased HDL increase my risk of coronary artery disease. C. The decreased HDL level will increase the amount of cholesterol moved away from the artery walls. D. Increased LDL has the potential to decrease my risk of heart disease.

Correct Answer is B

Explanation

Choice B rationale:

LDL (low-density lipoprotein) cholesterol is often referred to as "bad" cholesterol. It contributes to the buildup of plaque in the arteries, which narrows the arteries and can lead to coronary artery disease (CAD). CAD is a major risk factor for heart attack and stroke.

HDL (high-density lipoprotein) cholesterol is often referred to as "good" cholesterol. It helps to remove LDL cholesterol from the arteries and transport it back to the liver, where it can be broken down and removed from the body. Therefore, a high HDL level is protective against heart disease.

An elevated LDL level and a lowered HDL level are both associated with an increased risk of CAD. This is because the elevated LDL level contributes to plaque buildup, while the lowered HDL level means that there is less "good" cholesterol available to remove the "bad" cholesterol from the arteries.

Therefore, the statement "Increased LDL and decreased HDL increase my risk of coronary artery disease" indicates an understanding of the significance of these cholesterol levels.

Choice A rationale:

This statement is incorrect. An increased LDL level will actually increase the amount of cholesterol deposited on the artery walls.

Choice C rationale:

This statement is also incorrect. A decreased HDL level will decrease the amount of cholesterol moved away from the artery walls.

Choice D rationale:

This statement is incorrect. Increased LDL has the potential to increase, not decrease, the risk of heart disease.

View Question and Answer

Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.

Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today

A nurse is describing the process by which blood is ejected into circulation as the chambers of the heart become smaller. How does the nurse categorize this action of the heart?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

What criteria should the nurse use to determine normal sinus rhythm for a client on a cardiac monitor? Select all that apply.

Correct Answer is ["C","D"]

Explanation

The nurse is conducting patient teaching about cholesterol levels. When discussing the patient’s elevated LDL and lowered HDL levels, which statement by the patient indicates an understanding of the significance of these levels?

Correct Answer is B

Explanation

A patient returns to the cardiac floor following a Cardiac Angiogram with Stent placement. What nursing interventions should be carried out? (Select all that apply)

A patient is scheduled for catheter ablation therapy. When describing this procedure to the patient’s family, what aspect of the treatment should the nurse address?

A B-type natriuretic peptide (BNP) sample has been drawn from an older adult patient who has been experiencing vital fatigue and shortness of breath. What diagnosis will this test allow the care team to investigate?

A nurse is caring for a client who had a percutaneous insertion of an inferior vena cava filter and was on heparin therapy before surgery. The nurse would inspect the surgical site most closely for signs of:

The nurse is assessing a patient following a cardiac catheterization. On assessment, they note muffled heart sounds, jugular vein distention, and hypotension. The nurse knows these are signs of what?

The nurse is responsible for the care of four patients. Which patient should the nurse assess first?

Aspirin is administered to the client experiencing an MI because of its:

Please identify the following rhythm:

A nurse is describing the process by which blood is ejected into circulation as the chambers of the heart become smaller.
How does the nurse categorize this action of the heart?