22.4 Flashcards
The small intestine has three regions:
the duodenum, jejunum, and ileum.
To increase surface area available for nutrient absorption, the internal surface of the small intestine is arranged into progressively smaller folds: _____, _____, and_____.
To increase surface area available for nutrient absorption, the internal surface of the small intestine is arranged into progressively smaller folds: circular folds, villi, and microvilli.
Villi surround a central core of capillaries and a ______. Between villi are intestinal ______that house ______.
Villi surround a central core of capillaries and a lacteal. Between villi are intestinal crypts that house glands.
The small intestine’s motility between meals is characterized by slow, rhythmic contractions of the ______.
migrating motor complex
During feeding, the small intestine exhibits ________ and ________ .
During feeding, the small intestine exhibits segmentation and peristalsis.
Which of the following does NOT increase surface area in the small intestine?
microvilli
circular folds
villi
rugae
Which of the following does NOT increase surface area in the small intestine?
microvilli
circular folds
villi
rugae
Which process is a squeezing motion of the circular layer of smooth muscle in the small intestine?
defecation
peristalsis
segmentation
deglutition
Which process is a squeezing motion of the circular layer of smooth muscle in the small intestine?
defecation
peristalsis
segmentation
deglutition
What is the final segment of the small intestine?
jejunum
pylorus
duodenum
ileum
What is the final segment of the small intestine?
jejunum
pylorus
duodenum
ileum
Which modification of the small intestine creates a brush border appearance upon microscopic examination?
plicae circulares
circular folds
villi
microvilli
Which modification of the small intestine creates a brush border appearance upon microscopic examination?
plicae circulares
circular folds
villi
microvilli
