Specialized cardiac muscle cells located in the right atrium near the junction of the superior vena cava serve as pacemaker cells and are called the _______.
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Q231: In fishes, blood enters a chamber called
Q232: Ectothermic reptiles
A) have continuously high metabolic demands.
B)
Q233: Which statement about African lungfishes is false?
A)
Q234: Which statement about open and closed circulatory
Q235: Bone marrow stem cells produce large cells
Q237: In humans, atrial septal defect is a
Q238: _ return oxygenated blood from the lungs
Q239: Arteries are vessels that carry blood away
Q240: _ are biconcave, flexible discs that transport
Q241: Which of the following about human red
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