During a cardiac catheterization blood samples from the right atrium, right ventricle, and pulmonary artery are analyzed for their oxygen content. Normally:
A. All contain less CO2 than does pulmonary vein blood.
B. All contain more oxygen than does pulmonary vein blood.
C. The samples of blood all contain about the same amount of oxygen.
D. Pulmonary artery blood contains more oxygen than the other samples.
Correct Answer: C. The samples of blood all contain about the same amount of oxygen
Blood samples from the right atrium, right ventricle, and pulmonary artery would all be about the same with regard to oxygen concentration. Such blood contains slightly less oxygen than does systemic arterial blood.
Option A: The right atrium receives blood from the body. This blood is low in oxygen. This is the blood from the veins. The right ventricle pumps the blood from the right atrium into the lungs to pick up oxygen and remove carbon dioxide. The left atrium receives blood from the lungs. This blood is rich in oxygen.
Option B: The pulmonary veins bring oxygen-rich blood to the left atrium. The pulmonary artery carries oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream.
Option D: The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. The aorta carries oxygen-rich blood to the body from the left ventricle.
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