The three most abundant classes of nutrients are __________. A. carbohydrates, proteins, and minerals |
B. fats, proteins, and carbohydrates |
Acid reflux into the esophagus ("heartburn") is normally prevented by __________. A. pharyngeal constrictors |
C. the lower esophageal sphincter (LES) |
The large intestine absorbs water, fats, and salts. True |
False |
Absorption of many nutrients starts in the stomach. True |
False |
Chylomicrons are secreted from the basal surface of the absorptive cells and taken into the lacteal in the villus. True |
True |
Lipids are transported to the surface of the intestinal absorptive cells by __________, and are then processed into __________. A. fat droplets; micelles |
D. micelles; chylomicrons |
Odor, sight, and taste stimulate salivatory nuclei in the cerebral cortex. True |
False |
A hepatic triad consists of __________. A. the right, left, and common hepatic ducts |
D. a bile ductule, a branch of the hepatic artery, and a branch of the hepatic portal vein |
The __________ regulates the flow of contents from the stomach to the duodenum. A. gastric rugae |
C. pyloric sphincter |
Which of the following is true regarding the difference between the mucosa of the small and large intestines? A. They both have villi, but only the small intestine has microvilli. |
B. The small intestine has deeper intestinal crypts than the large intestine. |
Which of the following is not a trigger for mass movements of the colon? A. The gastrocolic reflex |
E. The colorectal reflex |
Hydrochloric acid (HCl) is secreted by __________ cells. A. mucous |
C. parietal |
The __________ stores excess glucose and releases it into the blood when needed. A. pancreas |
C. liver |
Pepsinogen is produced by __________ and is activated by __________, which is secreted by __________. A. chief cells; carbonic anhydrase (CAH); parietal cells |
B. chief cells; hydrochloric acid (HCl); parietal cells |
The __________ of the small intestine is/are similar to the __________ of the stomach. A. villi; pyloric glands |
C. intestinal crypts; gastric pits |
The large intestine is longer than the small intestine. True |
False |
The enzyme that catalyzes the first step reaction in HCl production by gastric parietal cells is called __________. A. carbonic acid |
B. carbonic anhydrase |
The __________ synthesizes bile acids by metabolizing __________. A. duodenum; neutral fats |
E. liver; cholesterol |
Carbohydrate digestion begins in the __________, whereas protein digestion begins in the __________. A. liver; small intestine |
C. mouth; stomach |
Gastric juice consists entirely of water and hydrochloric acid. True |
False |
Which of the following is the proper sequence by which proteins are digested by different enzymes? A. Pepsin, trypsin, carboxypeptidase, dipeptidase |
A. Pepsin, trypsin, carboxypeptidase, dipeptidase |
Which of the following nutrients must be digested in order to be absorbed? A. Water |
C. Proteins |
The small intestine begins with the duodenum, which is its longest segment. True |
False |
Enamel is found in the crown of a tooth, whereas dentin is part of both the crown and the root. True |
True |
The __________ gland is an extrinsic salivary gland, whereas the __________ gland is an intrinsic salivary gland. A. lingual; labial |
B. submandibular; lingual |
Which of the following statements regarding the migrating motor complex is true? A. It milks the chyme toward the colon. |
A. It milks the chyme toward the colon. |
Several digestive enzymes are secreted as zymogens because __________. A. it saves one step in their synthesis |
D. they act only in the stomach lumen and do not digest intracellular proteins |
__________ is a hormone, whereas __________ is an enzyme. A. Enterokinase; pepsin |
E. Secretin; pepsin |
Lecithin prepares fats for hydrolysis by forming __________. A. triglycerides, fatty acids, and glycerol |
D. emulsification droplets |
The swallowing center is located in the __________. A. mouth |
D. medulla oblongata |
Which of the following is the correct list of tooth anatomy from the most superficial to the deepest? A. Cementum, root canal, enamel |
D. Enamel, dentin, pulp |
Which of the following is not a function of gastric hydrochloric acid (HCl)? A. Activate pepsinogen to pepsin |
C. Emulsify lipids |
The surface of the tongue is covered with __________ stratified squamous epithelium, and has bumps called __________, where many taste buds can be found. A. keratinized; lingual papillae |
C. nonkeratinized; lingual papillae |
The enzyme(s) called __________ break(s) down the substrate called __________. A. lactase; glucose |
B. peptidases; proteins |
The oral phase of swallowing is under __________ control and the pharyngo-esophageal phase is __________. A. central nervous system; also controlled by the central nervous system |
B. central nervous system; controlled by autonomic reflexes |
Which of the following statements is true regarding the sodium-glucose transport protein (SGLP)? A. It is a uniport carrier. |
D. It transports glucose and sodium from the intestinal lumen into the epithelial cells. |
Necessary for Vitamin B12 absorption, __________ is/are secreted by __________ cells. A. intrinsic factor; parietal |
A. intrinsic factor; parietal |
Which of the following is not normally found in saliva? A. Mucus |
E. Protease |
The brush borders of intestinal absorptive cells contain numerous goblet cells. True |
False |
Most fat is digested by pancreatic lipase. True |
True |
Of the following components of bile, only __________ has/have a digestive function. A. bile salts |
A. bile salts |
Which of the following is not associated with the large absorptive surface of the small intestine? A. Circular folds (plicae circulares) |
E. Rugae |
Contact digestion takes place in/at the __________. A. gastric pits |
D. brush border of the small intestine |
Which of the following is not a component of the pancreatic juice? A. Trypsinogen |
E. Enterokinase |
The enterogastric reflex serves to __________. A. relax the stomach in preparation for swallowed food |
D. inhibit gastric motility when there is chyme in the small intestine |
Defecation is stimulated by __________. A. the chemical composition of the feces |
E. stretching of the rectum |
The __________ phase is associated with food stretching the stomach and activating myenteric and vagovagal reflexes, which in turn stimulate gastric secretions. A. cephalic |
B. gastric |
The liver is the body’s largest gland. True |
True |
Which of the following nutrients is absorbed by the lacteals of the small intestine? A. Triglycerides |
A. Triglycerides |
Pancreatic enzymes are secreted in response to a hormone called __________. A. insulin |
B. cholecystokinin (CCK) |
The movement of colonic contents from one puckered section to another is called __________. A. the gastrocolic reflex |
D. haustral contraction |
Which of the following enzymes functions at the lowest pH? A. Salivary amylase |
C. Pepsin |
Which of the following is not a process carried out by bacterial flora? A. Digestion of most of the proteins we get in the diet |
A. Digestion of most of the proteins we get in the diet |
Bacteria constitute about __________% of the dry weight of the feces. A. 2 |
C. 30 |
Amino acids and monosaccharides are absorbed in the __________, and fatty acids are absorbed in the __________. A. small intestine; large intestine |
E. small intestine; small intestine |
Both pancreatic juice and bile are secreted into the duodenum. True |
True |
The muscle tone of the __________ along the colon contracts it lengthwise, causing its walls to bulge and form pouches called __________. A. circular folds; ceca |
B. taeniae coli; haustra |
Infants have __________ deciduous teeth, whereas adults have __________ permanent teeth. A. 20; 32 |
A. 20; 32 |
EXTRA CREDIT: A. the nasal cavity |
A. the nasal cavity |
EXTRA CREDIT: A. in inhale air |
B. to screen out, kill, and remove dust, dirt, and pathogens from inhaled air |
EXTRA CREDIT: A. ventilation (breathing) |
C. gas exchange between air and blood |
EXTRA CREDIT: A. amino acids |
E. protein |
EXTRA CREDIT: A. High blood pressure |
C. Low blood pressure |
EXTRA CREDIT: A. Proximal convoluted tubule |
B. Base of the Loop of Henle |
Digestions sections 2-7 A and P
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