Question

there are 3 branches off the aortic arch. place the appropriate 3 branches in order. right common carotid a. right subclavian a. left common carotid a. left external carotid a. left subclavian a. right coronary a. left internal carotid a. brachiocephalic trunk first branch second branch third branch

Explanation:

The aortic arch has three main branches. The first branch is the brachiocephalic trunk. It then divides into the right common carotid artery and the right subclavian artery. The second branch directly from the aortic arch is the left common carotid artery. The third branch is the left subclavian artery. The other options like the right coronary artery is a branch of the ascending aorta (not the arch), and the left external and internal carotid arteries are branches of the left common carotid artery (not directly from the aortic arch).

Answer:

First branch: Brachiocephalic trunk
Second branch: Left common carotid a.
Third branch: Left subclavian a.