What is the function of the anatomical structure indicated by the blue arrow in the image below?

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Options:
explanation: The image shows a sagittal section through the heart. The anterior aspect of the heart is on the right side of the image and the posterior aspect of the heart is on the left side of the image. The arrow indicates the rightt pulmonary artery, whose function is to transport deoxygenated blood from the right atrium to the right lung. This answer describes the function of the right pulmonary artery. Orientating yourself is key to working out the correct answer. This can be identified as the right pulmonary artery because the ventricle pictured here has a thin myocardium, which confirms that this is the right ventricle. 
name: Transports deoxygenated blood from the right ventricle to the right lung
label: b
answer: yes
explanation: The image shows a sagittal section through the heart. The anterior aspect of the heart is on the right side of the image and the posterior aspect of the heart is on the left side of the image. The arrow indicates the right pulmonary artery, whose function is to transport deoxygenated blood from the right ventricle to the right lung. This answer is not correct – the blood vessels drain into the right atrium are the superior and the inferior venae cava, Pulmonary veins transport oxygenated blood from the lungs to the LEFT atrium.
name: Transports oxygenated blood from the lungs to the right atrium
label: d
answer: no
explanation: The image shows a sagittal section through the heart. The anterior aspect of the heart is on the right side of the image and the posterior aspect of the heart is on the left side of the image. The arrow indicates the right pulmonary artery, whose function is to transport deoxygenated blood from the right ventricle to the right lung. This answer is not correct, because the right atrium does not send blood directly to the lung, but to the right ventricle.
name: Transports oxygenated blood from the right atrium to the right lung
label: e
answer: no
explanation: The image shows a sagittal section through the heart. The anterior aspect of the heart is on the right side of the image and the posterior aspect of the heart is on the left side of the image. The arrow indicates the right pulmonary artery, whose function is to transport deoxygenated blood from the right ventricle to the right lung. The fact hat you can see the right ventricle in the image tells you that the cut is slightly tot he right and therefore this must be the right pulmonary artery.
name: Transports deoxygenated blood form the right ventricle to the left lung
label: a
answer: no
explanation: The image shows a sagittal section through the heart. The anterior aspect of the heart is on the right side of the image and the posterior aspect of the heart is on the left side of the image. The arrow indicates the right pulmonary artery, whose function is to transport deoxygenated blood from the right ventricle to the right lung. This answer describes the function of the left pulmonary vein, which is much smaller in diameter than the left pulmonary artery, so the answer is not correct.
name: Transports oxygenated blood from the lung to the left atrium
label: c
answer: no

Correct answer: b