Question

In the large intestine, the wall has three strips of longitudinal muscle called the

A) muscularis mucosa.
B) muscularis interna.
C) taenia coli.
D) haustral bands.
E) muscularis externa.

Answer 1

C) taenia coli.

The three strips of longitudinal muscle in the large intestine's wall are called the taenia coli, which create haustra and give the colon a wrinkled appearance.

Step-by-step explanation:

In the large intestine, the wall has three strips of longitudinal muscle called the taenia coli. These are bands of smooth muscle that constitute the longitudinal layer of the muscularis of the large intestine. The taenia coli are responsible for the bunching up of the colon into pouches known as haustra, which give the colon its wrinkled appearance. The other options provided, such as muscularis mucosa and muscularis externa, refer to different muscle layers found in the gastrointestinal tract. The muscularis mucosa is a thin layer that causes the stomach and small intestine mucosa to form folds, increasing the surface area for digestion and absorption. In contrast, the muscularis externa typically includes both an inner circular and an outer longitudinal layer of smooth muscle, important for peristalsis and movement of food through the GI tract.