The kidneys are located retroperitoneally. This means they are __________Blank the peritoneum.Multiple Choicebehindwithinin front ofabove

The correct answer is behind.

Explanation:

The term "retroperitoneally" refers to the anatomical position of the kidneys in relation to the peritoneum, which is a serous membrane lining the abdominal cavity and covering the abdominal organs. When an organ is described as retroperitoneal, it means that it is situated behind the peritoneal cavity.

In the case of the kidneys, they are located in the posterior part of the abdominal cavity and are thus positioned behind the peritoneum. This retroperitoneal placement means that certain structures, such as the aorta and inferior vena cava, are in front of the kidneys, while the kidneys themselves are protected by the lower ribs and surrounded by fat and connective tissue which helps to stabilize their position and protect them from trauma.

Overall, the kidneys are not encased in the peritoneal sac, which would imply that they are intraperitoneal; rather, they are firmly positioned in the back of the abdominal cavity, thereby functioning effectively within their anatomical context.