Final answer:
The abdominal part of the diaphragm receives blood from the inferior phrenic arteries, which branch off from the abdominal aorta.
Step-by-step explanation:
The blood supply to the abdominal part of the diaphragm primarily comes from the inferior phrenic arteries, which are branches of the abdominal aorta. These arteries specifically supply blood to the inferior surface of the diaphragm. The abdominal aorta provides several critical branches that serve various organs within the abdominal cavity, but it's the inferior phrenic arteries that play the critical role in supplying the diaphragm. This is essential since the diaphragm is a major muscle involved in breathing and various other physiological processes such as the Valsalva maneuver, which is used during acts like defecation, urination, and childbirth.