When the bladder is empty it's lining is thrown into folds called rugae. It allows the stomach and other tissues to expand when needed.
They are called "rugae", similarly to what is described here on answers.com for the stomach.
Rugae
When the bladder is empty, it's inner wall has many folds, as it fills with urine, the wall becomes smoother. At the same time, the superior surface of the bladder expands upward into a dome.
The endothelial lining of an artery cannot contract, so when an artery constricts, its endothelium is thrown into folds that give arterial sections a pleated appearance.Arteries are more resilient: When stretched, they keep their shape and elongate, and when released, they snap back.
false. they are folds within the bladder
The ribbon-like folds on the inner lining of the mitochondrial membrane are called cristae.
The ribbon-like folds on the inner lining of the mitochondrial membrane are called cristae.
Stomach is lined by various folds of mucous membrane and muscle tissue. These folds are termed as Rugae. This results in the characteristic appearance of stomach on the endoscopy.
The ribbon-like folds on the inner lining of the mitochondrial membrane are called cristae.
Rugae
The lining of a pig stomach has multiple folds called rugae. These folds churn and mix the food with the digestive juices. They also allow the stomach to stretch without rupturing the lining.
Rugae
stomach
The folds are called rugae and they are specialised mucosa designed to withstand abrasive forces of masticated food