The base, or lower portion, of the heart is formed by the tip of the left ventricle.
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Q1: Approximately one third of the heart lies
Q3: The heart is divided into _ chambers
Q4: An internal wall of connective tissue called
Q5: The _ is a double-walled sac that
Q6: The normal pacemaker of the heart is
Q7: Which of the following circles around the
Q8: The right atrium receives venous blood from
Q9: Movement of blood from the left ventricle
Q10: The _ refractory period corresponds with the
Q11: What are the two phases of the
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