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- Contraction of _______ drives the flow of blood through the aorta and pulmonary arteries. a. atria b. veins c. arterioles d. VentriclesWhich of the following statements is false?a. Only arteries carry oxygenated blood.b. Both arteries and veins have a layer of smooth muscle.c. Capillary beds lie between arteries and veins.d. Sphincters regulate the flow of blood through capillaries.When moving from lying down to standing, blood pressure would drop most significantly where? a) in the inferior vena cava b) in the splenic artery c) in the lower extremities d) in pulmonary vein
- Which of these organs is able to tolerate the greatest reduction in blood flow? a. Brain b. Heart c.Skeletal muscles d.SkinWhich blood vessels have the smallest diameter? A. Capillaries B. Arterioles C. Venules D. LymphaticThe endocardium is composed of __________. A collagen fibers and the lumen B myocardiocytes C a think layer of flat epithelial cells D cardiac muscle cells
- Which of the choices below best describes the systemic circulation of blood?a. The flow of blood into the right atrium and eventually out of the left ventricle.b. The movement of blood from the pulmonary trunk, through capillaries into the pulmonary veins.c. The movement of blood into the coronary arteries, through capillaries into the coronary sinus.d. The movement of blood from the aorta, through arteries and capillaries and then eventually to the vena cavae.Which of the following vessels has the largest lumen and a thin tunica media? A Veins B Capillaries C ArteriesWhich of the following best describes the primary role of resistance vessels? Group of answer choices a.Providing nutrient supply to the walls of larger vessels b. They regulate arterial blood pressure and blood flow within the organs. c. Ensuring blood storage during periods of low cardiac output d. Directing blood flow to specific organs based on demand
- The vein through which blood reaches the heart from the abdominopelvic viscera is the (a) superior vena cava, (b) internal jugular vein, (c) inferior vena cava, (d) portal vein.Which of the following is a large blood vessel that carries blood away from the heart? A. Vein B. Artery C. Capillary D. NerveReduction in the lumen diameter of a blood vessel as the smooth muscle contracts is known as __________. A arteriosclerosis B atherosclerosis C vasodilation D vasoconstriction E varicose veins
