BIO.CH.21.QUIZ - Question 1 5 out of 5 points The layer of...

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Unformatted text preview: Question 1 5 out of 5 points The layer of vascular tissue that consists of an endothelial lining and an underlying layer of connective tissue dominated by elastic fibers is the: Answer Selected Answer: tunica interna Correct Answer: tunica interna Question 2 5 out of 5 points Smooth muscle fibers in arteries and veins are found in the: Answer Selected Answer: tunica media Correct Answer: tunica media Question 3 5 out of 5 points The unidirectional flow of blood in venules and medium-sized veins is maintained by: Answer Selected Answer: the presence of valves Correct Answer: the presence of valves Question 4 5 out of 5 points Of the following blood vessels, the greatest resistance to blood flow occurs in the: Answer Selected Answer: arterioles Correct Answer: arterioles H Question 5 0 out of 5 points If the systolic pressure is 120 mm Hg and the diastolic pressure is 90 mm Hg, the mean arterial pressure (MAP) is: Answer Selected Answer: 80 mm Hg Correct Answer: 100 mm Hg H Question 6 0 out of 5 points The most important determinant of vascular resistance is: Answer Selected Answer: A combination of neural and hormonal mechanisms Correct Answer: friction between the blood and the vessel walls y Question 7 5 out of 5 points The two major factors affecting blood flow rates are: Answer Selected Answer: pressure and resistance Correct Answer: pressure and resistance y Question 8 5 out of 5 points The formula F = P/R means: (Note: F = flow; P = pressure; R = resistance) Answer Selected Answer: increasing P, decreasing R, increasing F Correct Answer: increasing P, decreasing R, increasing F Question 9 5 out of 5 points Atrial natriuretic peptide (ANP) reduces blood volume and pressure by: Answer Selected Answer: a, b, and c are correct Correct Answer: a, b, and c are correct Question 10 0 out of 5 points The central regulation of cardiac output primarily involves the activities of the: Answer Selected Answer: somatic nervous system Correct Answer: autonomic nervous system P Question 11 0 out of 5 points An increase in cardiac output normally occurs during: Answer Selected Answer: stimulation of the vasomotor center Correct Answer: widespread sympathetic stimulation Question 12 0 out of 5 points The three primary interrelated changes that occur as exercise begins are: Answer Selected Answer: decreasing vasodilation, increasing venous return, increasing cardiac output Correct Answer: increasing vasodilation, increasing venous return, increasing cardiac output Question 13 5 out of 5 points The only area of the body where the blood supply is unaffected while exercising at maximum levels is the: Answer Selected Answer: Brain Correct Answer: Brain x Question 14 0 out of 5 points The four large blood vessels, two from each lung, that empty into the left atrium, completing the pulmonary circuit, are the: Answer Selected Answer: pulmonary arteries Correct Answer: pulmonary veins x Question 15 0 out of 5 points The blood vessels that provide blood to capillary networks that surround the alveoli in the lungs are: Answer Selected Answer: fenestrated capillaries Correct Answer: pulmonary arterioles y Question 16 0 out of 5 points As the external iliac artery leaves the body trunk and enters the lower limb, it becomes the: Answer Selected Answer: anterior fibular artery Correct Answer: femoral artery y Question 17 5 out of 5 points The link between adjacent arteries or veins that reduces the impact of a temporary or permanent occlusion of a single blood vessel is: Answer Selected Answer: an anastomoses Correct Answer: an anastomoses % Question 18 0 out of 5 points The large blood vessel that collects most of the venous blood from organs below the diaphragm is the: Answer Selected Answer: hepatic portal vein Correct Answer: inferior vena cava % Question 19 5 out of 5 points Blood from the lower limbs, the pelvis, and the lower abdomen is delivered to the: Answer Selected Answer: external iliac veins Correct Answer: external iliac veins y Question 20 5 out of 5 points Blood leaving the capillaries supplied by the celiac, superior, and inferior mesenteric arteries flows into the: Answer Selected Answer: hepatic portal system Correct Answer: hepatic portal system Question 21 0 out of 5 points The nutritional and respiratory needs of a fetus are provided by: Answer Selected Answer: a, b, and c are correct Correct Answer: diffusion across the placenta Question 22 5 out of 5 points In early fetal life, the foramen ovale allows blood to flow freely from the: Answer Selected Answer: right atrium to the left atrium Correct Answer: right atrium to the left atrium Question 23 0 out of 5 points In the adult, the ductus arteriosus persist as a fibrous cord called the: Answer Selected Answer: ductus venosus Correct Answer: ligamentum arteriosum M Question 24 0 out of 5 points A few seconds after birth, rising O2 levels stimulate the constriction of the ductus arteriosus, isolating the: Answer Selected Answer: ligamentum arteriosum and fossa ovalis Correct Answer: pulmonary and aortic trunks @ Question 25 0 out of 5 points The primary effect of a decrease in the hematocrit of elderly individuals is: Answer Selected Answer: thrombus formation in the blood vessels Correct Answer: a lowering of the oxygen-carrying capacity of the blood @ Question 26 0 out of 5 points In traveling from the heart to the peripheral capillaries, blood passes through: Answer Selected Answer: veins, venules, and arterioles Correct Answer: elastic arteries, muscular arteries, and arterioles Question 27 0 out of 5 points At any given moment, the systematic circulation contains about __________ of the total blood volume. Answer Selected Answer: 51% Correct Answer: 91% Question 28 0 out of 5 points The goal of cardiovascular regulation is: Answer Selected Answer: to equalize the stroke volume with the cardiac output Correct Answer: maintenance of adequate blood flow through peripheral tissues and organs Question 29 0 out of 5 points Along the length of a typical capillary, blood pressure gradually falls from about: Answer Selected Answer: 15 to 5 mm Hg Correct Answer: 30 to 18 mm Hg Question 30 0 out of 5 points In which of the following organs would you find fenestrated capillaries? Answer Selected Answer: kidneys Correct Answer: both a and c Question 31 0 out of 5 points The average pressure in arteries is approximately: Answer Selected Answer: 120 mm Hg Correct Answer: 100 mm Hg Question 32 0 out of 5 points The average pressure in veins is approximately: Answer Selected Answer: 80 mm Hg Correct Answer: 15 mm Hg ` Question 33 5 out of 5 points When fluid moves across capillary membranes, the pressures forcing fluid out of the capillaries are: Answer Selected Answer: hydrostatic pressure; interstitial osmotic pressure Correct Answer: hydrostatic pressure; interstitial osmotic pressure X Question 34 0 out of 5 points The formula for resistance, R = Ln/r4, where (L) is the length of the vessel, (n) is the viscosity of the blood, and r is the radius of the vessel, would confirm the following correct relationship: Answer Selected Answer: decreasing radius, decreasing friction, decreasing flow Correct Answer: increasing radius, decreasing friction, increasing flow X Question 35 0 out of 5 points Considering cardiac output (CO), mean arterial pressure (AP), and total peripheral resistance (PR), the relationship among flow, pressure, and resistance could be expressed as: Answer Selected Answer: AP = CO x PR Correct Answer: a, b, and c are correct i Question 36 0 out of 5 points To increase blood flow to an adjacent capillary, the local controls that operate are: Answer Selected Answer: increasing O2, increasing CO2, increasing pH Correct Answer: decreasing O2, increasing CO2, decreasing pH i Question 37 0 out of 5 points The adrenergic fibers innervating arterioles are __________ fibers that release __________ and cause __________. Answer Selected Answer: parasympathetic; norepinephrine; vasodilation Correct Answer: sympathetic; norepinephrine; vasoconstriction Question 38 0 out of 5 points Two arteries formed by the bifurcation of the brachiocephalic artery are the: Answer Selected Answer: aorta, subclavian Correct Answer: common carotid, subclavian Question 39 5 out of 5 points The artery that serves the posterior thigh is the: Answer Selected Answer: deep femoral Correct Answer: deep femoral Question 40 0 out of 5 points The __________ return blood to the heart and the __________ transport blood away from the heart. Answer Selected Answer: arteries; veins Correct Answer: veins; arteries Question 41 0 out of 5 points The large vein that drains the thorax is the: Answer Selected Answer: internal jugular Correct Answer: azygous vein P Question 42 5 out of 5 points The veins that drain the head, neck, and upper extremities are the: Answer Selected Answer: brachiocephalics Correct Answer: brachiocephalics Question 43 0 out of 5 points The veins that drain venous blood from the legs and the pelvis are: Answer Selected Answer: great saphenous Correct Answer: common iliacs Question 44 5 out of 5 points The vein that drains the knee region of the body is the: Answer Selected Answer: popliteal Correct Answer: popliteal x Question 45 0 out of 5 points The large artery that serves the brain is the: Answer Selected Answer: external carotid Correct Answer: internal carotid x Question 46 5 out of 5 points The "link" between the subclavian and brachial artery is the: Answer Selected Answer: axillary Correct Answer: axillary ^ Question 47 0 out of 5 points The three arterial branches of the celiac trunk are the: Answer Selected Answer: splenic, pancreatic, mesenteric Correct Answer: L. gastric, splenic, hepatic ^ Question 48 5 out of 5 points The artery that supplies most of the small intestine and the first half of the large intestine is the: Answer Selected Answer: superior mesenteric Correct Answer: superior mesenteric % Question 49 0 out of 5 points The artery that supplies the pelvic organs is the: Answer Selected Answer: femoral artery Correct Answer: internal iliac artery % Question 50 0 out of 5 points The subdivision(s) of the popliteal artery is (are): Answer Selected Answer: femoral and deep femoral arteries Correct Answer: anterior and posterior tibial arteries ...
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This note was uploaded on 05/02/2011 for the course BIOLOGY 159 taught by Professor Hamm during the Spring '11 term at Harry S. Truman College - CCC.

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