Heart rate decreases during diving in seals and other animals. Thus the ascending aorta becomes very important during diving as it helps to maintain blood pressure during prolonged dives. A new study published in the American Journal of Physiology - Regulatory, Integrative and Comparative Physiology was designed to examine the ascending aorta of hooded seals (Cystophora cristata) and the tiny blood vessels that supply nutrients to it, called the vasa vasorum.
Blix AS, Kuttner S, Messelt EB. The ascending aorta of hooded seals with particular emphasis on its vasa vasorum. American Journal of Physiology - Regulatory, Integrative and Comparative Physiology. [Epub ahead of print] doi: 10.1152/ajpregu.00070.2016.