Ch 24: The Digestive System Group 3: Sections 24.6 to 24.7 Dynamic Study Module
What is the main stimulus that triggers the defecation reflex?
Distension of the rectum
The primary functions of intestinal juices include which of the following?
all correct to moisten the chyme to dissolve digestive enzymes and the products of digestion to assist in buffering acids
The muscular sphincter that guards the opening between the ileum and the cecum is the __________.
ileocecal valve
The hormone gastrin __________.
increases the activity of the parietal and chief cells
The two positive-feedback loops involved in the defecation reflex are __________.
the stretch receptors in the rectal walls and the sacral parasympathetic system
What is the hormone secreted by the small intestine that dilates capillaries in the small intestine area?
vip
How does the mucosa of the distal rectum compare with that of the colon and the cecum?
The colon and the cecum are lined with a simple columnar epithelium for absorption, whereas the distal rectum is lined with a stratified squamous epithelium because the rectum is next to the opening to the exterior of the body.
The small, slender structure that is attached to the large intestine and is suffused with lymphoid nodules is the __________.
appendix
Which hormone is secreted when chyme, expecially when it's rich in lipids and partially digested proteins, enters the duodenum?
cck
Which of the following is NOT a region of the small intestine?
cecum
The numerous transverse folds in the small intestine that serve to increase the surface area for absorption are the __________.
circular folds (plicae cicrulares)
The reflex that occurs in the rectum and promotes the movement of feces toward the anus is the __________.
defecation reflex
Which peptide hormone causes the secretion of insulin from the pancreatic islets?
gip
What are the pouches that give the colon its typical appearance?
haustra
The primary effect of secretin is to __________.
increase the secretion of bile and buffers by the liver and the pancreas
Which of the following produces, on a daily basis, the least number of the peristaltic contractions that force food through the digestive tract?
Large intestine
Which of the following is not true of the microbiome?
Produce vitamin C
What is the correct sequence of parts in the colon moving from the small intestine to the anus?
Cecum; ascending colon; transverse colon; descending colon; sigmoid colon; rectum
There are some obvious bends in the colon that you don't see in the small intestine. What are the names of these bends?
Flexures
What is perhaps the most important function of the large intestine?
Water reabsorption
What is the average composition of fecal waste material?
75 percent water, 5 percent bacteria, and 20 percent indigestible materials, inorganic matter, and epithelial remains
Which of the following are NOT absorbed in the large intestine?
All of the listed substances are absorbed in the large intestine.
The plicae of the intestinal mucosa, which bears the intestinal villi, are structural features that __________.
increase the total surface area for absorption
Fatty acids and lipids are absorbed into the ____________ found in each villus of the small intestine.
lacteal
Villikinin, motilin, and somatostatin are produced in the __________.
small intestine
