The major means of propelling food through the digestive tract is __________.
In addition to storage and mechanical breakdown of food, the stomach ________.
-initiates protein digestion and denatures proteins
-is the only place where fats are completely digested
-is the first site where chemical digestion of starch takes place
-is the first site where absorption takes place
initiates protein digestion and denatures proteins
Fats significantly delay the emptying of the stomach.
Which organ of the digestive tract is the body's major digestive organ?
Most digestion and absorption of nutrients occur in the __________.
What part of the tooth bears the force of chewing?
What is the major digestive function of the pancreas?
-production of bicarbonate ions
-production of insulin
-production of glucagon
-production of digestive enzymes
production of digestive enzymes
Which of the following is NOT a characteristic of the stomach?
-The stomach releases enzymes to digest carbohydrates.
-The stomach produces a double-layered coat of alkaline mucus.
-The stomach mucosa is folded into rugae.
-The stomach has three layers of muscle in the muscularis tunic.
The stomach releases enzymes to digest carbohydrates
Peristaltic waves are ________.
-churning movements of the gastrointestinal tract
-waves of muscular contractions that propel contents from one point to another
-pendular movements of the gastrointestinal tract
-segmental regions of the gastrointestinal tract
waves of muscular contractions that propel contents from one point to another
The mucosa collapses inward when the stomach is empty, forming large folds known as __________.
The __________ is the last segment of the small intestine.
How would you classify chewing food?
Which of the following is not a factor that helps create the stomach mucosal barrier?
-tight junctions of epithelial mucosa cells
-replacing of damaged epithelial mucosa cells
-production of intrinsic factor
-thick coating of bicarbonate-rich mucus
production of intrinsic factor
The mechanical and chemical receptors that control digestive activity are located ________.
-in the glandular tissue that lines the organ lumen
-in the pons and medulla
-in the oral cavity
-in the walls of the tract organs
in the walls of the tract organs
Chemical digestion reduces large complex molecules to simpler compounds by the process of ________.
The __________ is the serous membrane that lines the abdominal body wall.
Most gastric ulcers are due to excessive production of hydrochloric acid.
Impacted wisdom teeth is a problem that is never observed in children because ______.
-their teeth are generally too small to become impacted
-the childhood lengthening of their jaw bones provides all of the deciduous teeth with lots of room to erupt through the gums
-they lack third molar teeth
-their wisdom teeth fall out before there is any opportunity for them to become impacted
they lack third molar teeth
What muscle forms the labia of the mouth?
Which of the following is NOT a structural modification of the small intestine to increase surface area?
There are three phases of gastric secretion. The cephalic phase occurs ________.
-at the end of a large meal, and the juices secreted are powerful
and remain in the GI tract for a long period of time
-immediately after food enters the stomach, preparing the small intestine for the influx of a variety of nutrients
-before food enters the stomach and is triggered by aroma, sight, or thought
-when the meal is excessively high in acids and neutralization is required
before food enters the stomach and is triggered by aroma, sight, or thought
From the esophagus to the anal canal, the walls of every organ of the alimentary canal are made up of the same four basic layers. Arrange them in order from the lumen.
-submucosa, serosa, muscularis externa, and
-muscularis externa, serosa, mucosa, and submucosa
-mucosa, submucosa, muscularis externa, and serosa
-serosa, mucosa, submucosa, and muscularis externa
mucosa, submucosa, muscularis externa, and serosa
(most, shy, monkeys eat, salad)
The chemical and mechanical processes of food breakdown are called ________.
All the chemical and mechanical phases of digestion from the mouth through the small intestine are directed toward changing food into forms that can pass through the epithelial cells lining the mucosa into the underlying blood and lymphatic vessels.
The __________ guards the entry of food into the stomach.
Which layer of the alimentary canal is constructed from either stratified squamous or simple columnar epithelium?
Which histological layer of the digestive tract is composed primarily of epithelial tissue?
The lamina propria is composed of ________.
-dense irregular connective tissue
-reticular connective tissue
-dense regular connective tissue
-loose connective tissue
loose connective tissue
The capillaries that nourish the epithelium and absorb digested nutrients lie in the ________.
Which is not a function of saliva?
Saliva cleanses the mouth.
Saliva dissolves food chemicals so they can be tasted.
Saliva contains enzymes that begin the chemical breakdown of proteins.
Saliva moistens food and helps compact it into a bolus.
Saliva contains enzymes that begin the chemical breakdown of proteins
How many deciduous teeth are there?
Pepsinogen is the precursor to the gastric enzyme for protein digestion and is secreted by the parietal cells.