Question

15 questions about the anatomy of the cardiovascular system :
question 8 :
the descending aorta is indicated by number ...
12
11
9

Explanation:

Step1: Recall Cardiovascular Anatomy

The descending aorta is a major blood vessel that runs down the posterior of the thoracic and abdominal cavities. In the diagram, we analyze the labeled numbers.

Step2: Identify the Descending Aorta

Looking at the options: Number 12 corresponds to the descending aorta (as it's the long vessel descending from the heart region downwards), 11 is likely a vein (like the superior vena cava or another venous structure), and 9 is related to the heart or pulmonary vessels. So the correct number indicating the descending aorta is 12.

Answer:

12 (the option with "12")