lect 4 pt 4

Ileocecal valve

A sphincter that controls the movement of material from the ileum into the cecum.

Cecum

The pouch-like first part of the large intestine that receives material from the ileum.

Appendix

A small structure attached to the cecum.

Ascending colon

The portion of the large intestine that travels upward from the cecum.

Transverse colon

The portion of the large intestine that travels across the body from one side to the other.

Descending colon

The portion of the large intestine that travels downward along the side of the body.

Sigmoid colon

The curved, S-shaped portion of the large intestine that follows the descending colon and leads toward the rectum.

Rectum

The segment of the digestive tract that follows the sigmoid colon and precedes the anus.

Anus

The terminal opening through which solid waste leaves the digestive tract.

Large intestine pathway

Ileocecal valve $\rightarrow$ Cecum $\rightarrow$ Ascending colon $\rightarrow$ Transverse colon $\rightarrow$ Descending colon $\rightarrow$ Sigmoid colon $\rightarrow$ Rectum $\rightarrow$ Anus

Haustra

The repeating pouch-like structures along the large intestine.

Ileocecal valve

A sphincter that controls the movement of material from the ileum into the cecum.

Cecum

The pouch-like first part of the large intestine that receives material from the ileum and begins the large intestine.

Appendix

A small, finger-like structure attached to the cecum that serves as a reservoir for beneficial bacteria to repopulate the large intestine.

Ascending colon

The portion of the large intestine that travels upward from the cecum along the right side of the body, moving intestinal contents upward.

Transverse colon

The portion of the large intestine that travels across the body from right to left, moving intestinal contents across the abdomen.

Descending colon

The portion of the large intestine that travels downward along the left side of the body, moving intestinal contents downward.

Sigmoid colon

The curved, S-shaped portion of the large intestine that follows the descending colon and moves waste toward the rectum.

Rectum

The muscular segment of the digestive tract that follows the sigmoid colon and precedes the anus, functioning to store solid waste and aid in elimination.

Anus

The terminal opening through which solid waste leaves the digestive tract, allowing elimination of feces from the body.

Large intestine pathway

Ileocecal valve $\rightarrow$ Cecum $\rightarrow$ Ascending colon $\rightarrow$ Transverse colon $\rightarrow$ Descending colon $\rightarrow$ Sigmoid colon $\rightarrow$ Rectum $\rightarrow$ Anus

Haustra

Repeating pouch-like structures along the large intestine that help with mixing and movement of intestinal contents.

Large intestine funciton

The final major portion of the digestive tract that

• absorbs water and electrolytes,

• absorbs nutrients from bacterial byproducts,

• compacts waste,

• and stores solid waste.

Primary functions of the large intestine

Water absorption, electrolyte absorption, waste compaction, and waste storage.

Bacterial byproducts in the large intestine

Nutrients produced by bacterial activity that are absorbed by the large intestine, accounting for about $10\%$ of overall nutrient uptake.

what does Water absorption in the large intestine do

The reabsorption of remaining water and electrolytes across the large intestine, which helps compact waste into feces.

why is Waste stored in the large intestine

The retention of solid waste within the large intestine until it can be eliminated.

Rectum function

Receives and stores solid waste, utilizing its muscular structure to aid in elimination.

Ileum function prior to the large intestine

Finishes nutrient absorption and provides immune protection through lymphoid nodules called Peyer's patches.

Haustral movement

Contractions associated with the haustra that help mix the contents of the large intestine.

Functional comparison: Small vs. Large Intestine

• The small intestine is primarily responsible for nutrient absorption,

• large intestine primarily absorbs water and electrolytes, compacts waste, and stores solid waste.