The last structure to be reached by a tracer substance injected into a patient's superior vena cava before leaving heart is

Right ventricle

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Left ventricle

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Pulmonary veins

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Left atrium

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Right atrium

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Solution

The correct option is A Left ventricle
The pathway of the blood in the heart occurs in the following manner:
Vena Cava
Right Atrium
Right Ventricle
Pulmonary artery
Lungs
Pulmonary Vein
Left Atrium
Left Ventricle
Aorta
Body organs.
So, The blood actually leaves the heart after the left ventricle. If any tracers substance is injected into a patient's superior vena cava, it shall visit all the chambers and the last chamber to be visited before it finally leaves the heart will be left ventricle.
Hence, the correct answer is 'Left Ventricle'.

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