Each heartbeat begins in the
A) sinoatrial node.
B) atrioventricular node.
C) right ventricle.
D) left atrium.
Correct Answer:
Verified
Q8: The circulatory, respiratory, and excretory systems work
Q9: Blood flowing back to the heart travels
Q10: Aside from getting enough calories, we also
Q11: Oxygenated blood is found in the
A)right ventricle
Q12: Which of the following are the oxygen-carrying
Q14: Blood in the left ventricle of the
Q15: The cells involved in blood clotting are
A)red
Q16: Blood in the right atrium of the
Q17: Which of the following breaks fats into
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