Choose true or false. Each right answer scores 1, and each wrong answer scores -1. Not answered questions score 0. True False 1) The circulatory system includes the cardiovascular system and lymphatic system. 2) Lymph flows through the cardiovascular system. 3) The blood vessel circuit that irrigates the lungs and the one that irrigates the rest of the body are connected to each other in the lungs. 4) In a portal system, the blood goes through capillary net, vein, and capillary net. 5) The three layers of an artery are tunica intima, tunica media, and tunica adventitia. 6) Vasa vasorum is a typical capillary net found in the liver. 7) Arteries drive blood from the organs to the heart. 8) Arteries show more muscle in the tunica media than veins. 9) Elastic arteries are middle-size arteries. 10) Elastic arteries show a thin tunica media. 11) Muscular arteries show diameters lower than 50 µm. 12) The number of layers of smooth muscle is lower in arterioles compared with muscular arteries. 13) Capillaries also have the three typical layers: tunica intima, tunica media, and tunica adventitia. 14) Fenestrated capillaries consist of an endothelium with perforations that can be freely crossed by blood plasma. 15) One feature of veins is a poorly developed tunica media. 16) Muscular and postcapillary veins show tunica media. 17) The heart is made up of smooth muscle cells because heart beating is involuntary. 18) The myocardium is the outer layer of the heart. 19) The aorta artery gets the blood from the left ventricle. 20) The heart valves are also made up of muscle. F-1) Arrows point to the elastic lamina of the tunica intima. F-2) Arrows point to the tunica adventitia of an artery. F-3) The numbers indicating capillaries are 2 and 3.
