Digestive System

Question 1

Organs of the GI Tract

Answer 1

• Mouth
• Pharynx
• Stomach
• Small intestine
• Large intestine
• Rectum
• Anus

Question 2

Accessory Organs

Answer 2

• Salivary glands
• Liver
• Pancreas
• Gallbladder

Question 3

Peristalsis

Answer 3

The smooth muscle in the walls of the GI tract contracts in a wavelike movement to propel the bolus (food) along to tract.

Question 4

Saliva Contains…

Answer 4

• Mucus binds and moistens the crushed food
• Amylase begin the digestion of the carbs
• LgA in saliva binds to microbes in mouth
• Lysozyme destroys bacteria

Question 5

Voluntary:

Answer 5

• Cheeks and tongue push back bolus towards pharynx and then towards larynx
• Epiglottis stops food from entering airways by closing when bolus is swallowed

Question 6

Involuntary

Answer 6

• The pharyngeal muscle propels the bolus into the oesophagus
• Peristalsis to oesophageal sphincter where it opens once food touches it

Question 7

What is in Gastric Juice?

Answer 7

• HCl – anti-bacterial effect and denatures proteins
• Mucus – alkaline, protects stomach wall from acid damage
• Pepsinogen – converts to pepsin (protease) when activated by acid, digests proteins
• Gastric lipase – digests lipids
• Intrinsic factor – allows vitamin B12 to be absorbed

Question 8

Chyme

Answer 8

Fluid that leaves stomach through pyloric sphincter.