Which of the following valves directs blood flow from the left atrium to the left ventricle? A. Mitral B. Tricuspid C. Aortic D. Pulmonic - Correct Answer-A. Mitral The layer of squamous cells that lines the cardiac chambers and valves is called the: A. myocardium B. endocardium C. epicardium D. Pericardium - Correct Answer-B. endocardium How much does the atrial kick increase the blood volume? A. 5%-10% B. 10%-15% C. 15%-20% D. 20%-25% - Correct Answer-C. 15%-20% Which of the following waves corresponds with the AV valve bulging during ventricular contraction? A. A wave B. C wave C. D wave D. V wave - Correct Answer-B. C wave (The A wave corresponds with atrial contraction, the C wave corresponds with the AV valve bulging during ventricular contraction, and the V wave corresponds to atrial filling. There is no D wave. What portions of the heart does the left anterior descending branch supply? A. Septal, anterior and apical B. Lateral and Posterior C. Lateral and septal D. Posterior and apical - Correct Answer-A. Septal, anterior, and apical What is the name for the arrangement in which separate cells of the myocardium can function together? A. Autoregulation B. Syncytium C. Ischemia D. Myocyte - Correct Answer-B. Syncytium The structure that is composed of six polypeptide chains, two heavy chains, and four light chains is called: A. actin B. tropomyosin C. troponin D. myosin - Correct