Question

In order to study blood circulation in rats, capillaries are observed in?
(a) Mesentery
(b) Kidney
(c) Liver
(d) Lung

Answer 1

A thin sheet of tissue that connects the intestine to the abdominal wall and also allows blood vessels, capillaries, nerves, and lymph vessels that supply the intestines.

Complete answer:
Blood circulation in rats is similar to human circulation but when compared to humans, rat blood vessels are very thin and delicate. The intestine of the rat contains mesentery that contains metarterioles. These are short vessels that connect venules and arterioles at the opposite end helps in bypassing the capillaries. They help in studying the blood circulation in mice and rats.

Additional Information: - Circulatory system in rats is similar to the human circulatory system. It also contains both pulmonary circulation and systemic circulation.
- Exchange of blood between lungs and heart via pulmonary artery and pulmonary veins is pulmonary circulation and the exchange of blood between heart and body tissues via systemic arteries and systemic veins are the systemic circulation
- Circulation specifically in the vasculature of the intestines is referred to as mesenteric circulation.
- Celiac axis, superior mesenteric artery, and inferior mesenteric artery are the three unpaired abdominal aortic trunks.
- Abdominal foregut and its accessory organs are supplied by the celiac axis, midgut to proximal two-thirds of the colon is supplied by superior mesenteric artery and hindgut is supplied by an inferior mesenteric artery which includes a distal third of the transverse colon, the descending colon, and rectum.
- Capillaries present in the mesenteric circulation are used to study circulation in rats and mice.
So, the correct answer is ‘mesentery’.

Note: The well-developed mesentery is found in the vertebrates that connect or attach the stomach and intestines to the abdominal wall. It also contains nerves, blood vessels, capillaries, lymph vessels supplying the gut. Mesenteries can also store fat.