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The heart rate speeds up or slows down because the


A) AV node detects lower levels of oxygen and sends faster signals to the SA node.
B) brain consciously detects the need for more oxygen and intentionally stimulates the heart.
C) medulla oblongata,through the autonomic system,stimulates or depresses heart rate based on activity and stress.
D) hormone epinephrine inhibits the heartbeat.
E) SA node detects lower levels of oxygen and sends faster signals to the AV node.

F) A) and B)
G) C) and D)

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The pulmonary semilunar valve prevents blood from reentering the


A) right atrium.
B) left atrium.
C) right ventricle.
D) left ventricle.
E) pulmonary trunk.

F) B) and E)
G) C) and D)

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Which of the following is true concerning a comparison of arteries and veins?


A) Both are attached to arterioles.
B) Both are attached to venules.
C) Both contain three layers in their walls.
D) Both contain valves.
E) Both allow nutrient exchange across their walls.

F) B) and C)
G) A) and D)

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List the five different types of white blood cells found in the human body in order of frequency,with the most common one first.

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Neutrophils are the most common type of ...

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Which specific component in hemoglobin combines with oxygen?


A) heme
B) globin
C) iron in the heme
D) iron in the globin
E) the polypeptide

F) A) and D)
G) B) and D)

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All of the following are normally found in the blood,except


A) fibrinogen.
B) glucose.
C) urea.
D) oxygen.
E) glycogen.

F) All of the above
G) A) and E)

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Blood traveling from the intestines to the liver travels through the


A) pulmonary vein.
B) inferior vena cava.
C) superior vena cava.
D) coronary vessels.
E) hepatic portal vein.

F) A) and B)
G) A) and C)

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Capillaries exchange oxygen and nutrients for wastes in the tissues.

A) True
B) False

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Hemophilia is an inherited clotting disorder found most often in males.

A) True
B) False

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Which of the following is a true statement about tissue fluid?


A) Tissue fluid exits from white blood cells.
B) Tissue fluid exits the capillary at the venous end.
C) Tissue fluid is collected by the lymphatic capillaries.
D) Tissue fluid contains more protein than blood.
E) Tissue fluid forms at the venous end of a capillary.

F) All of the above
G) B) and C)

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What is a clot called that remains at its origin? What is a clot called that breaks away and becomes lodged in the lungs?


A) thrombus; cerebral embolism
B) embolus; cerebral embolism
C) thrombus; pulmonary embolism
D) embolus; pulmonary embolism
E) thrombus; stroke

F) C) and E)
G) A) and D)

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Hyptertension is sometimes called the silent killer because no symptoms may be experienced until a stroke or heart attack occurs.

A) True
B) False

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Contraction of the right ventricle forces blood initially into the


A) left atrium.
B) right atrium.
C) aorta.
D) pulmonary vein.
E) pulmonary artery.

F) A) and D)
G) B) and E)

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Researchers have long attempted to find a substitute for red blood cells,specifically the hemoglobin carrying ability.With the low but possible risk of disease transfer from blood transfusion,such a synthetic substance could be guaranteed safe if it was effective.Which of the following properties would be important for "artificial red blood cells"?


A) must attach to and never release oxygen
B) must release oxygen to any other medium despite concentration gradient
C) would bind to iron molecules already bound to other artificial blood units
D) must provide the clotting reaction
E) would bind to oxygen in a high oxygen concentration solution and release oxygen when in a low oxygen concentration solution

F) C) and E)
G) None of the above

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What is the correct sequence in which a drop of blood returning from the body encounters the heart valves?


A) right atrioventricular valve \rightarrow aortic semilunar valve \rightarrow left atrioventricular valve \rightarrow pulmonary semilunar valve
B) right atrioventricular valve \rightarrow pulmonary semilunar valve \rightarrow left atrioventricular valve \rightarrow aortic semilunar valve
C) left atrioventricular valve \rightarrow pulmonary semilunar valve \rightarrow right atrioventricular valve \rightarrow aortic semilunar valve
D) pulmonary semilunar valve \rightarrow left atrioventricular valve \rightarrow aortic semilunar valve \rightarrow right atrioventricular valve
E) left atrioventricular valve \rightarrow aortic semilunar valve \rightarrow right atrioventricular valve \rightarrow pulmonary semilunar valve

F) C) and E)
G) A) and B)

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The element in your blood necessary for the clotting process is


A) calcium.
B) phosphorus.
C) chlorine.
D) iron.
E) sodium.

F) A) and D)
G) A) and B)

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"Artery" and "vein" are defined by whether they leave or enter the heart.If they were defined by whether they carried oxygenated or deoxygenated blood,we would have to change the name(s) of


A) the hepatic portal vein to a hepatic portal artery.
B) the hepatic and renal systems (they would have to be switched) .
C) the pulmonary artery and vein (they would have to be switched) .
D) the coronary artery and vein (they would have to be switched) .
E) the aorta and vena cava.

F) A) and B)
G) D) and E)

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When arterioles constrict,blood pressure decreases.

A) True
B) False

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Usually there is only one capillary bed between an artery and vein; an exception to this is the


A) coronary vessels that serve the heart.
B) pulmonary system that serves the lungs and where all factors are reversed.
C) hepatic portal system which runs from the capillary bed in the intestine to the capillary bed in the liver via a hepatic portal vein.
D) brain circulation which requires special continuous blood flow.
E) large bones that lack capillaries but are fed by an artery/vein system.

F) A) and E)
G) B) and E)

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A heart murmur that sounded "lub-dup-shush" would indicate which of the following?


A) atrioventricular valve is not closing properly
B) semilunar valve is not closing properly
C) high blood pressure in the atria
D) ventricles are not contracting properly
E) low blood pressure in the ventricles

F) None of the above
G) B) and E)

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