How it Works
Try Naxlex NCLEX-RN (Free-Trial)

Which of the following accurately describes the process of coronary circulation?

A.

Coronary arteries are filled with blood during atrial contraction

B.

Coronary circulation occurs only during systole

C.

Coronary veins return deoxygenated blood to the right atrium

D.

Coronary arteries supply deoxygenated blood to the heart muscle

Answer and Explanation

The Correct Answer is C

A. Coronary arteries are filled with blood during atrial contraction:
Coronary arteries are primarily perfused during diastole, not atrial contraction. During systole, contraction of the ventricles compresses the coronary vessels, reducing blood flow.

B. Coronary circulation occurs only during systole:
Coronary blood flow mostly occurs during diastole, because the myocardial contraction during systole compresses the coronary vessels, especially in the left ventricle.

C. Coronary veins return deoxygenated blood to the right atrium:
Coronary veins collect deoxygenated blood from the myocardium and empty it into the right atrium via the coronary sinus, completing the coronary circulation.

D. Coronary arteries supply deoxygenated blood to the heart muscle:
Coronary arteries supply oxygenated blood to the heart muscle, not deoxygenated blood.


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

Naxlex Comprehensive Predictor Exams

Free Nursing Study Resources

Related Questions

Correct Answer is D

Explanation

A. Tricuspid valve closure:
The tricuspid valve is best auscultated at the lower left sternal border (4th-5th intercostal space), not the midclavicular line. It controls flow from the right atrium to the right ventricle. Murmurs here indicate right-sided AV valve pathology.

B. Aortic valve closure:
The aortic valve is heard at the second intercostal space, right sternal border. Its closure produces part of S2 at the base of the heart.

C. Pulmonic valve closure:
The pulmonic valve is heard at the second intercostal space, left sternal border, also contributing to S2.

D. Mitral valve closure:
The mitral valve is best auscultated at the apex of the heart (5th intercostal space, left midclavicular line). Closure of the mitral valve produces S1, marking the beginning of ventricular systole. This is crucial for evaluating left-sided heart function.

Correct Answer is D

Explanation

A. Between the left ventricle and aorta; prevents backflow of blood into the left ventricle:
This describes the aortic valve, not the mitral valve. The aortic valve prevents backflow from the aorta into the left ventricle. Confusing these can lead to misinterpretation of murmurs or heart sounds.

B. Between the right atrium and right ventricle; prevents backflow of blood into the right atrium:
This describes the tricuspid valve, which is on the right side of the heart. The mitral valve is on the left side.

C. Between the right ventricle and pulmonary artery; prevents backflow of blood into the right ventricle:
This describes the pulmonic valve, which is located at the right ventricular outflow tract, not the mitral valve.

D. Between the left atrium and left ventricle; prevents backflow of blood into the left atrium:
The mitral valve (also called the bicuspid valve) is located between the left atrium and left ventricle. Its primary function is to allow unidirectional blood flow into the left ventricle during diastole and prevent regurgitation into the left atrium during systole, maintaining efficient cardiac output.

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

Register