Understanding EKG Ch.1 Questions answered 100% Correct

The fibrous sac covering of the heart, which is in contact with the pleura, is the: a. Epicardium b. Myocardium c. Pericardium d. Endocardium - ANSWER-c. Pericardium The lower chamber of the heart, with the thickest myocardium, is the: a. Right b. Left - ANSWER-b. Left The pulmonic and aortic valves are open during: a. Systole b. Diastole - ANSWER-a. Systole The large blood vessel that returns unoxygenated blood from the head and neck to the right atrium is called the: a. Jugular vein b. Carotid artery c. Superior vena cava d. Inferior vena cava - ANSWER-c. Superior vena cava The right coronary artery branches supply oxygenrich blood to a portion of the: a. Electrical conduction system b. Left circumflex arteries c. Sympathetic nervous system d. Coronary sinus - ANSWER-a. Electrical conduction system The most numerous blood vessels in the body are the: a. Arteries c. Venules b. Capillaries d. Veins - ANSWER-b. Capillaries Blood flow between the heart and lungs is _______ circulation. a. Systemic c. Myocardial b. Venous d. Pulmonary - ANSWER-d. Pulmonary These blood vessels function under high pressure in order to convey blood from the heart out to the rest of the body: