Final Practice Questions Flashcards
Which statment concerning the intrinsic plexeuses is INCORRECT?
a. the myentric plexes is located in the submucosa
b. the plaxuses innervate smooth muscle cells and exocrine and endocrine glands
c. the plexuses are influenced by extrinsic nerves
d. the plexuses coordinate local digestive tract activity
A
About 9,500ml of lfuid is absorbed from the digestive tract daily. What is the ultimate source of most of the fluid?
a. food and fluid ingested during meals
b. stored within the secretory cells of the digestive tract
c. the plasma
d. the accessory digestive organs
c
During the oropharyngeal phase of swallowing, how is the food prevented from entering the other openings that communicate with the pharynx
a. elevation of the uvula, which lodges against the back of the throat
b. closure of the nasopharyngeal sphincter
c. closure of the epiglostis blocking the opening between the vocal cords
d. elevation of the larynx and the closure of the vocal cords across the largyngeal opening
d
which hormones act in the small intestine
a. secretin and cholecytokinin
b. sercretin and gastrin
c. cholecytoskokinin and gastrin
d. gastrin
A
which statement concerning the stomach acid is INCORRECT
a. it is nutrilized in the duodenum
b. it is nutrilized with bicarbonate
c. it is nutrilized by solutions secreted by the G cells
C
why does the pyloric gland area of the stomach atrum secrete
a. histamine
b. gastrin
c. intrinsic factor
d. respiration is inhibited
B
what does NOT occur in vomiting
a. the diaphragm contracts
b. the abdominal muscles contract
c. the stomach contracts
d. respiration is inhibited
C
Which statement concerning cholecytokinin is INCORRECT
a. it is secreted by the endocrine portion of the pancrease
b. it stimulates pancreatic enzyme secretion
c. it causes contraction of the gullbaldder
A
Which statement is not a function of the gullbaldder
a. metabolic processing of carbohydrates, proteins, and fats
b. secretion of the proteolytic digestive enzymes
c. detoxification and or degration of body wastes, hormones, drugs, and foreign compounds
d. synthesis of plasma protiens essential in the clotting process
B
which statement concerning secretin is correct?
a. the most potent stimulus for secritin secretion is the presence of fat in the doudenum
b. stimualtes pancreatic enzyme secretion
c. secretion stimulates the secretion of bicarbonate
d. secretion stimulates the acinar cells
C
Where is digestion completed?
a. stomach
b. small intestine luman
c. on the brush boarders of the small intestine epithelial cells
d. colon
C
which enzyme breaks down table sugar?
a. maltase
b. lactase
c. surcare
d. enterokinase
C
Which statement concerning chylomicrons is correct?
a. they are aggretions of the triglyceride formed within intestinal epithelial cells and covered with a layer of lipoprotein, which renders the water soluable
b. they are aggregations of bile salts, monoglycerides, and free fatty acids
c. they are small fat globules held apart by the actions of bile salts
d. they are secreted in the succus mucus
A
What is the intestinal feature responsiable for increasing the absorbative surface area
a. circular folds
b. vili
c. microvili
d. crypts
C
Which statement concering defication reflex is NOT correct?
a. absorption of salt and water converts the colonic contents into fecal matter
b. colonic bacteria digest cellulose for their growth and reproduction
c. when mass movements of the colon propel feces into the rectum, stimulation of the stretch receptors in the rectal wall rectal wall reflexively causes contraction of the internal and external anal sphincters to prevent defication from occuring until and opportume time
d. no digestive enzymes are secreted by the colon
C
