Which of the Following is True About the Left Ventricular

Question

Which of the following is true about the left ventricular myocardium?
A) Pumps blood into the pulmonary artery
B) Contraction is caused by the sliding of actin and myosin
C) Receives oxygenated blood from the precordium
D) Contains unoxygenated blood

Accepted Answer

The left ventricular myocardium is a layer of muscular tissue that surrounds the left ventricle of the heart. It is responsible for contracting and pumping oxygenated blood into the aorta for distribution to the rest of the body. This contraction is caused by the sliding of actin and myosin filaments within the cells of the myocardium. Therefore, choice B is the correct answer. The other choices are incorrect: A) The left ventricular myocardium pumps blood into the aorta, not the pulmonary artery. C) The left ventricular myocardium does not receive blood from the precordium; it receives blood from the lungs via the pulmonary veins. D) The left ventricular myocardium contains oxygenated blood, not unoxygenated blood.