On day 21 following fertilization, the paired endocardial tubes unite to form the primitive heart tube.
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Q17: Which of the following is an example
Q18: When auscultating heart sounds, S1 is caused
Q19: Which of the following vessels deliver blood
Q20: The atrio-ventricular (AV) valve in the left
Q21: The pericardium is composed of elastic connective
Q23: The middle cardiac vein in the posterior
Q24: The coronary arteries carry oxygenated blood to
Q25: Anastomoses are only found in the heart,
Q26: The tricuspid valve is located at the
Q27: The fossa ovalis is a thin spot
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