A) represents 60% of the sample and is composed of leukocytes and platelets.
B) represents 45% of the sample and is composed of plasma.
C) represents 60% of the sample and is composed of erythrocytes.
D) represents 55% of the sample and is composed of plasma.
E) represents 45% of the sample and is composed of erythrocytes.
G) A) and E)
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A) is highest when the heart relaxes.
B) can decrease because of atherosclerosis.
C) can be lowered by the constriction of arterioles.
D) is considered high when it is above 100/70 mm Hg.
E) contributes to movement of substances from the blood into the tissues.
G) B) and E)
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A) One is found at the entrance to the pulmonary trunk.
B) Their closing causes the second, shorter "dub" sound of the heartbeat.
C) They connect the atria and ventricles.
D) One is found at the entrance to the aorta.
E) They are composed of three half moon shaped flaps.
G) A) and B)
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A) white blood cell
B) red blood cell
C) platelet
D) erythrocyte
E) cardiac muscle cell
G) A) and B)
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A) is large in diameter with a thick muscle and elastic layer.
B) is called the pulmonary trunk.
C) has many valves along its length to assist in blood flow.
D) is comprised of a single layer of thin epithelial cells.
E) is called the superior vena cava.
G) C) and D)
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A) pulmonary circulation.
B) systemic circulation.
C) lymphatic system.
D) portal system.
E) oxygen exchange system.
G) A) and B)
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A) are types of erythrocytes.
B) result in phagocytized pathogens.
C) produce antibodies in response to pathogens.
D) release kinins which attract platelets.
E) are responsible for specific immunity.
G) All of the above
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A) the relaxation of heart muscle.
B) the contraction of the atria.
C) the closing of the atrioventricular valves.
D) the opening of the semilunar valves.
E) the contraction of the ventricles.
G) B) and D)
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B) False
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A) well developed middle layer with smooth muscle and elastic tissue - arteries
B) narrow, microscopic tubes of endothelium - capillaries
C) valves are present insuring one-way flow of blood - veins
D) thick, well developed walls due to the presence of a thick layer of smooth muscle - veins
E) formed from capillaries and join to form veins - venules
G) A) and E)
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A) They do not have tissues and organs.
B) They may rely on diffusion for the transfer of gases, nutrients, and wastes.
C) There are no animals without circulatory systems.
D) They tend to have large bodies.
E) The body cells are typically distant from the source of the oxygen so the gas has to diffuse through several layers to reach all cells.
G) C) and E)
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