WorksheetsDigestive System Quiz
Total questions: 42
Worksheet time: 21mins
Which of the following organs is considered an accessory digestive organ but not part of the GI tract?
Esophagus
Stomach
Liver
Ileum
Which segment of the digestive system is lined with secretory and transporting epithelium and contains sphincters to regulate segmental functions?
Respiratory tract
GI tract
Urinary tract
Lymphatic duct
Why is the digestive tract lumen considered part of the external environment?
It has a low pH.
It contains enzymes.
It is continuously open to the external surface.
It hosts endocrine glands.
Which of the following is not one of the primary stages of food processing in the GI tract?
Ingestion
Emulsification
Absorption
Elimination
The term "alimentary" in "alimentary canal" specifically refers to:
A canal transporting oxygen
Nourishment or sustenance
Muscular tube only
Excretion pathway
The gut microbiota mainly reside in which segment of the digestive tract?
Stomach
Duodenum
Large intestine
Esophagus
Chyme is best described as:
Fully digested nutrients
Acidic secretion from the pancreas
Thick, semifluid mass of partially digested food
Alkaline bile product
Which layer of the digestive tract contains Meissner's plexus?
Mucosa
Submucosa
Muscularis externa
Serosa
The inner circular and outer longitudinal muscles of the GI tract are found in:
Mucosa
Submucosa
Muscularis externa
Serosa
Which nervous system is referred to as the "second brain" in the digestive system?
Sympathetic
Central Nervous System
Enteric Nervous System
Autonomic Nervous System
Dogiel cells found in the enteric nervous system are primarily:
Secretory cells
Multipolar neurons
Sensory photoreceptors
Endocrine regulators
Which cranial nerve provides parasympathetic innervation to the GI tract?
Trigeminal
Glossopharyngeal
Vagus
Accessory
Submucosal plexus primarily regulates:
Motility of the GI tract
Gastric secretions
Local blood flow and secretions
Voluntary swallowing
What is the embryological origin of the enteric nervous system?
Mesoderm
Neural crest cells
Endoderm
Somites
Gastric juice is mainly composed of:
Bile, amylase, mucus
HCl, pepsinogen, mucus
Insulin, glucagon
Amylase, maltase
Which cell type secretes pepsinogen in the stomach?
Parietal cells
Chief cells
G cells
Goblet cells
The role of HCl in the stomach includes all EXCEPT:
Denaturation of proteins
Conversion of pepsinogen to pepsin
Neutralization of chyme
Antimicrobial action
Which hormone stimulates HCl secretion by parietal cells?
Secretin
Gastrin
CCK
GIP
Intrinsic factor secreted by the stomach is essential for the absorption of:
Iron
Vitamin D
Vitamin B12
Folate
Cephalic phase of gastric secretion is primarily triggered by:
Hormonal signals from duodenum
Stretch receptors in the stomach
Sensory stimuli (sight, smell, taste)
Presence of amino acids in the small intestine
Which of the following phases is longest in regulating gastric secretions?
Cephalic
Gastric
Intestinal
Neural
Which phase involves inhibition of gastric secretion?
Cephalic
Gastric
Intestinal
All of the above
Which cells in the stomach secrete gastrin?
D cells
G cells
Parietal cells
Mucous cells
The enterogastric reflex functions to:
Increase secretion of gastric enzymes
Stimulate stomach emptying
Inhibit gastric motility and secretion
Increase bile production
Which anatomical layer of the GI tract contains both blood vessels and lymphatic vessels for nutrient absorption?
Mucosa
Submucosa
Muscularis externa
Serosa
Which type of epithelium lines most of the GI tract, facilitating absorption and secretion?
Stratified squamous epithelium
Pseudostratified columnar epithelium
Simple columnar epithelium
Transitional epithelium
Which of the following correctly matches a secretion with its primary site of production?
Bile - Stomach
Pepsinogen - Parietal cells
HCl - Chief cells
Gastrin - G cells of stomach
The GI tract's local reflexes are mediated by which of the following?
Spinal cord
Myenteric and submucosal plexuses
Brainstem
Vagus nerve alone
In the mucosa, the lamina propria is composed of:
Stratified squamous epithelium
Smooth muscle only
Loose connective tissue with capillaries
Dense fibrous connective tissue
Which phase of gastric secretion is most influenced by emotional stimuli?
Intestinal phase
Cephalic phase
Gastric phase
Colonic phase
Histamine stimulates acid secretion in the stomach by acting on:
Nicotinic receptors
H1 receptors
H2 receptors
GABA receptors
Which component directly activates parietal cells via intracellular cAMP signaling?
Acetylcholine
Gastrin
Histamine
Secretin
The gastric phase of secretion is initiated by:
Stretching of the duodenum
Arrival of food in the mouth
Distention of the stomach and presence of peptides
Release of bile
Which of the following is NOT a stimulus for gastric secretion?
Acetylcholine
Histamine
Gastrin
Somatostatin
Somatostatin inhibits gastric secretion by directly affecting:
Enterochromaffin-like (ECL) cells
Chief cells
D cells
Mucous neck cells
The major role of the circular muscle layer in the muscularis externa is to:
Shorten the digestive tract
Increase the surface area
Narrow the lumen during contraction
Secrete digestive enzymes
Which statement about chief cells is correct?
They secrete hydrochloric acid.
They are located in the duodenum.
They release pepsinogen which is activated in acidic conditions.
They secrete intrinsic factor.
Which of the following is a key function of mucus secreted in the stomach?
Facilitates protein digestion
Enhances acid production
Protects mucosal lining from acid and enzymes
Stimulates G cell activation
The transition from voluntary to involuntary control in swallowing occurs at the level of:
Oral cavity
Pharynx
Upper esophageal sphincter
Lower esophageal sphincter
Pepsin becomes inactive at which approximate pH range?
1.0-2.5
2.5-4.0
6.5-7.0
7.5-9.0
Which of the following pairs is incorrectly matched?
Parietal cells - HCl
Chief cells - Pepsinogen
G cells - Gastrin
Mucous cells - Bile
Which neurotransmitter is involved in stimulating gastric acid secretion via parasympathetic activation?
Dopamine
Serotonin
Acetylcholine
Norepinephrine
