The blood vessel on the image is the
Small cardiac vein
Coronary sinus
Anterior cardiac vein
Superior vena cava
Middle cardiac vein
Great cardiac vein
The Correct Answer is F
A. Small cardiac vein: The small cardiac vein runs along the right margin of the heart and drains blood from the right atrium and ventricle. It empties into the coronary sinus, facilitating venous return to the right atrium.
B. Coronary sinus: The coronary sinus is a large venous channel on the posterior aspect of the heart. It collects most cardiac venous blood and drains directly into the right atrium, completing coronary circulation.
C. Anterior cardiac vein: The anterior cardiac veins run along the anterior surface of the right ventricle. They bypass the coronary sinus, draining directly into the right atrium, and contribute to the venous return from the right ventricular myocardium.
D. Superior vena cava: The superior vena cava is a major systemic vein that returns deoxygenated blood from the upper body, including the head, neck, and upper limbs, directly into the right atrium of the heart.
E. Middle cardiac vein; The middle cardiac vein runs in the posterior interventricular sulcus, draining the posterior portion of both ventricles. It empties into the coronary sinus, ensuring efficient venous return from the heart’s posterior myocardium.
F. Great cardiac vein: The blood vessel highlighted in the image is the great cardiac vein located on the anterior surface of the heart. The great cardiac vein begins at the apex of the heart and eventually curves around the left side of the heart (within the coronary sulcus) to empty into the coronary sinus on the posterior side. It is the principal vein of the anterior heart.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Weaker contractions: Within normal physiological limits, increasing ventricular stretch does not weaken contractions. Weak contractions may occur only if the muscle is overstretched beyond its optimal sarcomere length, which exceeds the Frank-Starling range.
B. Enhanced force of contraction: The Frank-Starling law of the heart states that increased ventricular filling stretches myocardial fibers, optimizing actin-myosin overlap within sarcomeres. This enhanced sarcomere alignment increases the force of contraction during systole, allowing the heart to eject a greater stroke volume in response to increased venous return.
C. Reduced stroke volume: Increasing ventricular preload within physiological limits actually increases stroke volume by enhancing contractile force. Stroke volume only decreases if the heart is overfilled beyond its optimal sarcomere length, leading to inefficient contraction.
D. Decreased venous return: Increasing ventricular stretch is a response to increased venous return, not a cause of decreased return. Venous return drives end-diastolic volume, which in turn stretches the ventricular muscle to regulate stroke volume according to the Frank-Starling mechanism.
Correct Answer is B
Explanation
Correct answer: False
The relative refractory period occurs during the latter part of the cardiac action potential, specifically during phase 3 (repolarization) of ventricular muscle cells. During this period, the myocardial cell has partially repolarized but has not yet fully returned to its resting membrane potential. While the cell can respond to a stronger-than-normal stimulus, normal stimuli will not trigger a contraction. Anatomically, this period applies to cardiac myocytes throughout the atria and ventricles, ensuring coordinated contractions while preventing premature or tetanic contractions, which could compromise effective 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