D. Inferior vena cava is not part of the splanchnic circulation. The splanchnic circulation includes the celiac artery, hepatic portal vein, and superior mesenteric artery, which supply blood to the digestive organs. The inferior vena cava returns blood from the lower body to the heart.
The artery that supplies the small intestine, cecum, ascending colon, and transverse colon is the superior mesenteric artery (SMA). It branches off from the abdominal aorta and provides blood to the majority of the small intestine and the first part of the large intestine. Key branches of the SMA include the jejunal and ileal arteries for the small intestine, as well as the ileocolic, right colic, and middle colic arteries for the cecum and colon.
superior Mesenteric artery
Inferior mesenteric
Superior mesenteric artery.
The superior Mesenteric artery supplied to Small intestine; upper half of the large intestine. And the inferiorMesenteric supplied to Lower half of the large intestine. The circulatory system Chapter 12, Structure and Function of the body. Yenny 2011
superior mesenteric artery
Small intestine
small intestine and proximal large intestine
The superior mesenteric artery supplies blood to the small intestine (jejunum and ileum), part of the large intestine (cecum, appendix, ascending colon, and proximal two-thirds of the transverse colon), and the pancreas.
The superior mesenteric artery supplies a major part of the large intestine, including the ascending and transverse colon, while the inferior mesenteric artery supplies the left side of the colon, including the descending colon and rectum.
In the small intestine, the epithelial cells lining the intestinal villi receive oxygen primarily through diffusion from the blood in the capillaries that surround them. These capillaries are part of the mesenteric blood supply, which is rich in oxygenated blood delivered from the superior mesenteric artery. The close proximity of the capillaries to the epithelial cells facilitates the exchange of gases and nutrients. Additionally, the small intestine's extensive surface area enhances this oxygen delivery process.