What is the name of the flap of tissue that prevents blood from flowing backward? Mention the name of all present in human heart?

Chen, a 78-year-old male has a long history of cardiovascular disease. Recently, he has developed “blue lines” bilaterally, distal to the knees. He is worried that this could be a sign of another heart attack or something similar, so he decides to seek treatment. His physician notes that Chen’s right leg has twisted bulging veins that are blue in color. His left leg has lighter-colored blue lines that are not raised from the surface of the skin. Chen reports that his right leg hurts, especially during and after exercise.   Chen reports that his father had varicose veins. Chen reports that he is mostly sedentary and spends a lot of time watching TV or playing board/card games. His BMI is 24, BP is 130/78, and pulse is 68. Which of the following statements is true?   Varicose veins are common in people under 30 years of age.   Varicose veins are common in pregnancy.   Men are more likely to develop varicose veins than women.…

Which of the following shows the pathway a blood cell in systemic circulation would take?   A "arteriole, artery, capillary, vein, venule "   B "artery, arteriole, capillary, venule, vein"   C "venule, arteriole, artery, capillary, vein"   D "vein, venule, arteriole, artery, capillary "

What type of connective tissue resides in the valves and ventricles of the heart, and the superior inferior Vena Cava, pulmonary trunk, pulmonary artery, Aorta?