The cardiovascular system is made up of ________, ________, and ________.
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Q83: The _ is a wall that separates
Q84: A heart with cells contracting rapidly in
Q85: The opening between each atrium and its
Q86: The muscle layer of the heart wall
Q87: The cells responsible for establishing the rate
Q89: The _ circuit carries blood to and
Q90: The AV node delays the transmission of
Q91: The heart is encased in a tough
Q92: The _ are calcium channels in cardiac
Q93: The _ directs blood from the _
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