Digestive System Chapter 23: Overview and GI Tract Layers

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What type of epithelium is found in the stomach and intestines of the GI tract?

Columnar (correct)

Cuboidal

Non-keratinized, stratified squamous

Simple squamous

Which layer of the GI tract is responsible for mechanical digestion and peristalsis in the small intestine?

Submucosa

Muscularis mucosa

Muscularis (correct)

Mucosa

What is the function of the lamina propria in the mucosa of the GI tract?

Absorbing nutrients

Transporting absorbed nutrients (correct)

Secreting mucus

Mechanical digestion

Which accessory digestive organ is responsible for secreting bile to aid in digestion?

Gallbladder Signup and view all the answers

In which part of the GI tract do we find skeletal muscle for swallowing and defecation?

Esophagus Signup and view all the answers

What is the function of the submucosal plexus in the GI tract?

Collection of nerves Signup and view all the answers

What is the primary function of chemical digestion in the digestive system?

Breaking down complex food molecules into their building blocks Signup and view all the answers

Which of the following is NOT a type of reflex involved in the regulatory mechanisms of the digestive system?

Hormonal reflex Signup and view all the answers

What is the function of Short reflexes in the digestive system?

Activate glands and muscle Signup and view all the answers

What controls the release of gastric acid in the digestive system?

Gastrin Signup and view all the answers

Which part of the mouth plays a role in preventing food from entering the nasal cavity?

Uvula Signup and view all the answers

What is the primary function of the tongue in the digestive process?

Mechanical and chemical digestion, swallowing, and vocalization Signup and view all the answers

What is the function of intrinsic factor in the stomach?

Facilitates the absorption of vitamin B12 in the small intestine Signup and view all the answers

Which accessory organ produces bile salts to emulsify lipids for digestion and absorption?

Liver Signup and view all the answers

What is the primary function of the pancreatic bicarbonate in digestion?

Neutralizing acidic chyme Signup and view all the answers

Which organ releases bile to aid in digestion?

Gallbladder Signup and view all the answers

What is the main purpose of segmentation in the small intestine?

Optimizing surface area for enzymatic activity Signup and view all the answers

What is the function of mucus in the large intestines?

Easing passage of feces through colon Signup and view all the answers

What is the primary function of the lower esophageal sphincter?

To prevent acid reflux from the stomach (GERD) Signup and view all the answers

Which of the following accurately describes the process of deglutition (swallowing)?

It is a three-phase process involving voluntary, pharyngeal, and esophageal phases Signup and view all the answers

Which part of the stomach is responsible for storing undigested food and gases?

Fundus Signup and view all the answers

What is the function of the pyloric sphincter?

To control the emptying of chyme from the stomach into the duodenum Signup and view all the answers

Which statement about the stomach is accurate?

The stomach can stretch to hold up to 4 liters of food and liquid Signup and view all the answers

What are the folds called in the deflated stomach when it is empty?

Rugae Signup and view all the answers

Which layer of the stomach is the most superficial?

Serosa Signup and view all the answers

What is the primary role of the autonomic nervous system in regulating the alimentary canal?

Restricting enteric neurons Signup and view all the answers

What is the primary function of the peritoneal cavity?

Holding digestive organs in place Signup and view all the answers

What is the main role of the mouth in the digestive process?

All of the above Signup and view all the answers

How does the hepatic portal system contribute to the blood supply of the alimentary canal?

Both a and b Signup and view all the answers

What is the primary function of the submucosal plexus of the enteric nervous system?

Regulating digestive secretions Signup and view all the answers

Digestive System Chapter 23: Overview and GI Tract Layers

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Questions and Answers

What type of epithelium is found in the stomach and intestines of the GI tract?

Which layer of the GI tract is responsible for mechanical digestion and peristalsis in the small intestine?

What is the function of the lamina propria in the mucosa of the GI tract?

Which accessory digestive organ is responsible for secreting bile to aid in digestion?

In which part of the GI tract do we find skeletal muscle for swallowing and defecation?

What is the function of the submucosal plexus in the GI tract?

What is the primary function of chemical digestion in the digestive system?

Which of the following is NOT a type of reflex involved in the regulatory mechanisms of the digestive system?

What is the function of Short reflexes in the digestive system?

What controls the release of gastric acid in the digestive system?

Which part of the mouth plays a role in preventing food from entering the nasal cavity?

What is the primary function of the tongue in the digestive process?

What is the function of intrinsic factor in the stomach?

Which accessory organ produces bile salts to emulsify lipids for digestion and absorption?

What is the primary function of the pancreatic bicarbonate in digestion?

Which organ releases bile to aid in digestion?

What is the main purpose of segmentation in the small intestine?

What is the function of mucus in the large intestines?

What is the primary function of the lower esophageal sphincter?

Which of the following accurately describes the process of deglutition (swallowing)?

Which part of the stomach is responsible for storing undigested food and gases?

What is the function of the pyloric sphincter?

Which statement about the stomach is accurate?

What are the folds called in the deflated stomach when it is empty?

Which layer of the stomach is the most superficial?

What is the primary role of the autonomic nervous system in regulating the alimentary canal?

What is the primary function of the peritoneal cavity?

What is the main role of the mouth in the digestive process?

How does the hepatic portal system contribute to the blood supply of the alimentary canal?

What is the primary function of the submucosal plexus of the enteric nervous system?

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