NU 606

what are the two layers of the pericardial sac correct answer: outer fibrous pericardium anchors the heart to diaphragm visceral pericardium (epicardium) has a serous membrane what is unique about cardiac muscle (myocardial fibers) correct answer: - no nerves are present intercalated discs at the junctions between fibers (they contain desmosomes, connections to prevent muscle cells from separating during contraction, and gap junctions, which permit ions to pass from cell to cell which fac...

What is the body's first line of defense? correct answer: mechanical barrier such as intact skin and mucous membrane Identify the body's second and third lines of defense. correct answer: second: processes of phagocytosis and inflammation; third: the immune system response Which of the three lines of defense are specific? Explain what is meant by "specific defense mechanism." correct answer: The immune system is the specific defense mechanism of the body. It provides protection by s...