30 Questions
What is the role of the myenteric plexus in the alimentary canal?
Regulating digestive secretions
Which nervous system innervates the alimentary canal extrinsically?
Autonomic nervous system
What is the function of the visceral peritoneum?
Envelopes the abdominal organs
During which process does the mouth begin the chemical breakdown of carbohydrates and lipids?
Activating in the stomach
What is the main function of the esophagus in the digestive system?
Propelling food to the stomach
What percentage of blood pumped enters arteries serving the intestines while resting and digesting?
25%
Which layer of the GI tract is responsible for mechanical digestion and peristalsis?
Muscularis
What type of epithelium is present in the stomach and intestines?
Columnar
Which layer of the GI tract contains goblet cells that secrete mucus?
Mucosa
What are the accessory digestive organs mentioned in the text?
Liver, gallbladder, pancreas
Which layer of the GI tract contains a collection of nerves called the submucosal plexus?
Submucosa
What type of muscle is involved in swallowing and defecation at both ends of the GI tract?
Skeletal muscle
What is the primary function of the small intestine in the digestive process?
Absorbing nutrients into the bloodstream
Which hormone stimulates the release of gastric acid in the stomach?
Gastrin
What is the primary function of the tongue in the digestive process?
All of the above
Which of the following is a short reflex in the digestive system?
Expansion of the stomach triggering increased digestive juice production
Which structure prevents food from entering the nasal cavity during swallowing?
Uvula
What is the process by which undigested materials are removed from the body?
Defecation
What is the primary function of the lower esophageal sphincter?
To regulate the movement of food from the esophagus to the stomach and prevent acid reflux
Which of the following is the correct sequence of the swallowing (deglutition) process?
Voluntary, pharyngeal, esophageal
What is the function of the pyloric sphincter?
To regulate the emptying of the stomach contents into the small intestine
Which part of the stomach stores undigested food and gases?
Fundus
What is the approximate time it takes for solid food to travel from the mouth to the stomach?
4-8 seconds
Which statement about the size of the stomach is true?
The empty stomach is about the size of a fist and can stretch to hold 4 liters
What is the primary function of the lingual frenulum?
To anchor the tongue to the floor of the mouth
Which of the following is NOT a component of saliva?
Carbohydrates
What is the function of the salivary amylase enzyme?
To initiate the breakdown of carbohydrates
Which of the following is NOT a type of teeth in the permanent set?
Bicuspids
What is the function of the epiglottis during swallowing?
To prevent food from entering the trachea
What is the approximate length of the esophagus?
10 inches
This quiz covers an overview of the digestive system, including the structure of the alimentary canal and the accessory digestive organs. It also delves into the layers of the gastrointestinal (GI) tract and their functions.
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