System Structure: Digestive - Massage and Bodywork Licensing Examination Mblex
- Identify the correct order of the colon segments after the cecum.
- Ascending, transverse, descending, sigmoid colon. This sequence allows for systematic water absorption and bacterial fermentation.
- What is the primary role of the esophagus?
- Transporting the bolus from pharynx to stomach. This muscular tube uses peristalsis to move swallowed food without further digestion.
- What is the function of the epiglottis during swallowing?
- It covers the laryngeal opening to protect the airway. This cartilage flap prevents aspiration by directing food into the esophagus during deglutition.
- Which salivary glands are located under the tongue?
- Sublingual glands. These smallest glands produce mucin-rich saliva for lubrication and minimal digestion.
- Which three segments make up the small intestine, in order?
- Duodenum, jejunum, ileum. These segments progressively handle digestion, with absorption peaking in the jejunum and ileum.
- What is the primary function of the small intestine?
- Most chemical digestion and nutrient absorption. Enzymes and bile complete macronutrient breakdown, enabling uptake into bloodstream.
- What is the function of hydrochloric acid in the stomach?
- Denatures proteins and activates pepsin; provides antimicrobial action. The acidic environment breaks down food proteins and kills ingested pathogens.
- What is the primary function of the digestive system?
- To ingest, digest, absorb nutrients, and eliminate solid waste. This system processes food to extract essential nutrients for energy and growth while removing indigestible remnants.
- Which structure marks the junction between the small and large intestines?
- Ileocecal valve. This sphincter prevents backflow from the colon into the ileum during peristalsis.
- Identify the correct order of the digestive tract from mouth to anus.
- Mouth, pharynx, esophagus, stomach, small intestine, large intestine, anus. The alimentary canal follows this sequential path to facilitate progressive digestion and absorption.
- Which salivary gland is located anterior to the ear and produces serous saliva?
- Parotid gland. As the largest salivary gland, it secretes watery saliva rich in amylase for starch digestion.
- Which salivary glands are located beneath the mandible?
- Submandibular glands. They secrete a mix of serous and mucous saliva to aid in initial food breakdown.
- What is the primary digestive function of bile?
- Emulsifies fats to increase surface area for lipase action. Bile salts act as detergents to break fat globules into micelles for enzymatic access.
- What is the function of the liver in digestion?
- Produces bile to aid fat digestion and absorption. Hepatocytes synthesize bile salts essential for lipid emulsification in the intestines.
- What is chyme?
- Semi-fluid mixture of partially digested food and gastric secretions. Gastric churning transforms ingested food into this acidic paste for duodenal entry.
- What is the primary digestive function of the pancreas?
- Secretes digestive enzymes and bicarbonate into the duodenum. Exocrine cells release proteases, lipases, amylases, and buffers to neutralize chyme acidity.
- What is peristalsis in the digestive tract?
- Wave-like smooth muscle contractions that propel contents forward. It facilitates propulsion of food through the gastrointestinal tract via rhythmic contractions.
- What structures increase small-intestine surface area for absorption?
- Villi and microvilli. These projections vastly expand the mucosal surface to maximize nutrient uptake efficiency.
- What is the function of the oral cavity in digestion?
- Mechanical breakdown and mixing with saliva to form a bolus. Chewing reduces food particle size, and saliva initiates enzymatic breakdown for easier swallowing.
- What is the primary function of the large intestine?
- Absorption of water and electrolytes; formation of feces. It reabsorbs remaining fluids and salts, compacting waste for elimination.
- What is the function of the gallbladder in digestion?
- Stores and concentrates bile and releases it into the duodenum. It concentrates bile from the liver for timed release in response to fatty meals.
- What is the function of the anal sphincters?
- Control defecation by regulating passage of feces through the anus. Internal and external sphincters coordinate to allow voluntary control over waste expulsion.
- What is the name of the sphincter between the stomach and duodenum?
- Pyloric sphincter. It regulates the release of chyme into the small intestine to control digestion pace.
- Which layer of the alimentary canal is responsible for most digestive movement?
- Muscularis externa (smooth muscle layers). Its longitudinal and circular muscles generate peristalsis and segmentation for propulsion and mixing.
- What is the name of the sphincter between the esophagus and stomach?
- Lower esophageal (cardiac) sphincter. It prevents reflux of gastric contents into the esophagus to avoid tissue damage.