PQ- Digestive System Part 2

How did Dr. Beaumont primarily conduct his experiments on Alexis St. Martin over several years?

• By performing daily surgical procedures to examine his stomach.

• By observing St. Martin's stomach through the fistula and analyzing gastric juices.

• By feeding St. Martin different foods and then surgically removing them for analysis.

• By using advanced imaging techniques to visualize the digestive process.

What is the primary mission of the digestive system?

• To produce hormones for body regulation.

• To filter waste products from the blood.

• To disassemble food into its tiniest, most basic molecular forms.

• To regulate body temperature and fluid balance.

Tags

NGSS.MS-LS2-3

Where does the process of mechanical and chemical digestion primarily begin?

• The esophagus

• The stomach

• The mouth (oral or buccal cavity)

• The small intestine

Tags

NGSS.MS-LS1-7

What type of tissue lines the inside of your mouth, allowing it to withstand friction from food?

• Simple columnar epithelium

• Stratified squamous epithelium

• Pseudostratified columnar epithelium

• Transitional epithelium

What is the function of the flexible posterior soft palate during swallowing?

• To mash food against the hard palate.

• To produce saliva for chemical digestion.

• To reflexively close off the nasopharynx, directing food to the esophagus.

• To detect taste and send signals to the brain.

What is the term for the ball of chewed and moistened food that the tongue rolls back to the pharynx in preparation for swallowing?

• Chyme

• Bolus

• Masticate

• Mucus

Which enzyme, found in saliva, begins the chemical breakdown of starches into glucose monomers?

• Pepsin

• Lipase

• Salivary amylase

• Protease

Tags

NGSS.MS-LS1-7

What is the process called by which food is propelled through the pharynx and esophagus?

• Absorption

• Mastication

• Peristalsis

• Deglutition

How much material can the human stomach typically hold at any given time?

• 0.5 to 1 liter

• 1 to 2 liters

• 2 to 4 liters

• 4 to 6 liters

What special modification does the stomach's muscularis externa have that provides extra strength for churning food?

• It has an additional layer of smooth muscle.

• It contains specialized skeletal muscle fibers.

• It is reinforced with cartilage.

• It is lined with a thick layer of adipose tissue.