The heart is enclosed in a membrane called________?
Correct answer: B. pericardium
- A. pleura
- B. pericardium
- C. peritoneum
- D. epithelium
Explanation
The pericardium is the double-layered membranous sac surrounding the heart and contains lubricating fluid that reduces friction during beating. The pleura surrounds the lungs, so it is the most likely alternative students choose by confusing the membranes of nearby thoracic organs.
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The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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