Which of the following would contain characteristics of cardiac muscle tissue, such as intercalated discs?
endocardium
parietal pericardium
epicardium
myocardium
The Correct Answer is D
A. Endocardium: The endocardium is the inner endothelial lining of the heart chambers (endothelium + connective tissue), not cardiac muscle, so it does not contain intercalated discs.
B. Parietal pericardium: The parietal pericardium is the outer layer of the serous/fibrous sac surrounding the heart (protective membrane), not muscle tissue, so it lacks intercalated discs.
C. Epicardium: The epicardium (visceral layer of serous pericardium) covers the heart surface and contains connective tissue and fat; it overlies the myocardium but is not the muscle layer itself, so it does not have intercalated discs.
D. Myocardium: The myocardium is the heart’s muscular wall composed of cardiac muscle cells that are connected by intercalated discs (for electrical and mechanical coupling).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Leukocytes: leukocytes are white blood cells; their breakdown does not produce biliverdin/bilirubin.
B. Hemoglobin: the heme portion of hemoglobin is degraded to biliverdin and then bilirubin (these are heme-breakdown pigments).
C. Foreign pathogens: pathogen breakdown is not the source of these pigments.
D. Erythropoietin: erythropoietin is a hormone that stimulates RBC production; it is not broken down into biliverdin/bilirubin.
Correct Answer is C
Explanation
A. Intercalated discs: Structures that connect cardiac cells and permit coordination, but not the term for the group behavior.
B. Chordae tendineae: Tendinous cords of AV valves; unrelated to cell-unit behavior.
C. Functional syncytium: Describes cells acting together as one unit due to electrical coupling.
D. Systole: The contraction phase of the cardiac cycle, not a term for a cell collective.
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
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.