ch20 - Exam Name MULTIPLE CHOICE. Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE.Choose the one alternative that best completes the statement or answers the question. 1)Artery is to ________ as vein is to ________.1) A)efferent; afferent B)afferent; efferent C)efferent; away D)afferent; away E)toward; away
2) The heart beats approximately ________ times each day. 2)
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3) The heart pumps approximately ________ liters of blood each day. 3)
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4) Excess fluid in the ________ causes cardiac tamponade. 4)
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5) Tetanic muscle contractions don't occur in a normal cardiac muscle because 5) A)the refractory period ends before the muscle reaches peak tension. B)potassium channels outnumber sodium channels. C)cardiac muscle tissue contracts on its own. D)neural stimulation is lacking. E)the refractory period lasts until the muscle relaxes.
6) The adult heart is roughly the size of 6)
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7)Which of the following descriptions matches the termnear the left fifth intercostal space?7)
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8)The term used to describe fluid collecting in the pericardial cavity that restricts the movement ofthe heart is known as 8)
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9)The interventricular sulci and coronary sulcus 9) A)contain arteries. B)contain fat. C) contain veins. D)are grooves on the surface of the heart. E)All of the answers are correct.
10) The structure that permits blood flow from the right atrium to the left atrium in the fetal circulation is the 10)
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11) Blood leaves the right ventricle by passing through the 11)
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12) Intercalated discs serve to transfer ________ from cell to cell. 12)
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13)Cardiac muscle cells and skeletal muscle cells differ in a few ways. Which of the following isnotone of them?13) A)Cardiac muscle cells lack transverse tubules. B)Cardiac muscle cells branch. C)Cardiac muscle cells are smaller in size. D)Skeletal muscle cells lack intercalated discs. E)Cardiac muscle cells have a single, centered nucleus.
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