How would you classify chewing food?
a. mechanical breakdown
b. digestion
c. propulsion
d. ingestion
answer
a. mechanical breakdown
Chewing breaks apart and grinds food and mixes it with saliva.
question
Which of the following functions is NOT correctly matched with its description?
a. propulsion: physical breakdown of ingested food in the GI tract
b. mechanical breakdown: churning movements in the GI tracts
c. ingestion: intake of food nutrients
d. absorption: intake of chemically processed nutrients
answer
a
Propulsion is the movement of ingested food through the GI tract.
question
Which of the following is NOT a means of mechanically breaking down food?
a. peristalsis
b. mastication
c. segmentation
d. churning
answer
a
Peristalsis is a physical process used for propulsion, or movement, through the GI tract.
question
Which layer of the alimentary canal is constructed from either stratified squamous or simple columnar epithelium?
a. mucosa
b. serosa
c. muscularis externa
d. submucosa
answer
a
The mucosa's inner lining is composed of columnar epithelium for most of the alimentary canal. Stratified squamous is used in the esophagus, oral cavity, and anus.
question
Which layer of the alimentary canal is responsible for segmentation and peristalsis?
a. muscularis externa
b. serosa
c. submucosa
d. mucosa
answer
a
Contractions of the circular and longitudinal layers of the muscularis externa produce the effects of peristalsis and segmentation. In the stomach, an additional muscle layer adds a twisting action.
question
The outermost tissue layer of the alimentary canal is the __________.
a. submucosa
b. serosa
c. muscularis
d. mucosa
answer
b
question
Unitary smooth muscle is found in all hollow organs except for the heart. What structure do both heart muscle and unitary smooth muscle share that allows them to contract as a functional group?
a. T tubules
b. epimysium
c. gap junctions
d. caveolae
answer
c
question
Which of the following does NOT describe a basic regulator of digestive control?
a. Digestive effectors are smooth muscle and glands.
b. conscious neural control
c. pH, stretch, and osmolarity are some of the inputs that can initiate digestive responses.
d. Short reflexes act locally in the GI tract.
answer
b.
Neural control over the digestive system is through the autonomic nervous system, which does not function under conscious control mechanisms.
question
Which of the following is NOT a function of saliva?
a. Saliva moistens food and helps compact it into a bolus.
b. Saliva cleanses the mouth.
c. Saliva dissolves food chemicals so that they can be tasted.
d. Saliva contains enzymes that begin the chemical breakdown of proteins.
answer
d
Saliva contains components with functions ranging from starch breakdown to fighting bacterial infection, but it does not contain any enzymes that digest protein.
question
Which of the following inhibits salivation?
a. being stressed or frightened
b. ingestion of spicy foods
c. the sight or smell of food
d. relaxing after a meal
answer
a
The sympathetic division of the autonomic nervous system is associated with fight-or-flight responses. Stimulation of the salivary glands by the SNS tends to inhibit flow, as when you are scared or nervous and your mouth "goes dry."
question
How many total permanent teeth should an adult have, assuming none have been lost or removed?
a. 8
b. 16
c. 20
d. 32
answer
d
There are two incisors (2I), one canine (1C), two premolars (2PM) and three molars (3M) for a total of 8 on each side of each jaw. Multiply by 4 for a total of 32 adult teeth.
question
label the
uvula
hard palate
tongue
esophagus
oropharynx
epiglottis
oral cavity
trachea
answer
art labeling question
question
Which digestive process does NOT occur in the mouth?
a. digestion
b. segmentation
c. ingestion
d. mechanical breakdown
answer
b
Segmentation is the back-and-forth mixing movement of food in the small intestine. The process of chewing and mixing food with saliva in the mouth is known as mastication.
question
Which layer of the stomach contains the gastric pits that secrete mucous, acid, and digestive enzymes?
a. serosa
b. muscularis externa
c. mucosa
d. submucosa
answer
c
The mucosa of the stomach contains the epithelial lining and the gastric pits, which extend down into the mucosa but do not penetrate the submucosa.
question
Which of these structures is found in the stomach but nowhere else in the alimentary canal?
a. an oblique muscle layer
b. a lining of columnar epithelium
c. mucus-forming cells
d. a circular muscle layer
answer
a
All areas of the alimentary canal have a circular and a longitudinal layer of muscle. The stomach has an additional oblique layer of muscle for "wringing" itself while processing food.
question
Which area of the stomach adjoins the small intestine?
a. pylorus
b. cardia
c. body
d. fundus
answer
a
The pylorus is the lowest part of the stomach. It attaches to and empties food into the small intestine via the pyloric sphincter.
question
label the following on the stomach
cardia
body
rugae
lesser curvature
pyloric antrum
pyloric sphincter
fundus
greater curvature
answer
artistic label
question
What role of the stomach is essential to life?
a. production of hydrochloric acid
b. production of VIP
c. production of intrinsic factor
d. production of chyme
answer
c
Without the production of intrinsic factor, the body would not be able to absorb vitamin B12 in the small intestine. This is the only factor that would cause problems with living.
question
Which of the following processes occurs in the stomach?
a. deglutition
b. absorption
c. mechanical digestion
d. defecation
answer
c
Mechanical digestion occurs in the stomach by churning.
question
Where does the process of segmentation occur?
a. small intestine
b. stomach
c. anus
d. esophagus
answer
a
Several areas of the digestive tract are capable of peristalsis, which propels food onward, but only the small intestine undergoes segmentation, whose purpose is mixing food with enzymes and bringing it close to intestinal walls.
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