Swollen lymph nodes signal infection and result from increased numbers of ________.
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Q11: The coronary arteries supply blood to cardiac
Q19: Why would someone need to have an
Q20: In an EKG,the QRS wave indicates what?
A)first
Q25: A (an)_ is a recording of the
Q27: The cells of the SA node are
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Q30: Because the sinoatrial node sends out impulses
Q31: The _ is a fibrous sac that
Q34: The _ valves prevent blood from flowing
Q40: The smallest arteries, called _, are barely
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