Lecture 4

Question 1

4 roles of digestive tract

Answer 1

1. digest
2. absorption
3. elimination
4. barrier fcn

Question 2

barrier fcn

Answer 2

prevents absorption of harmful substances

Question 3

enzymes

Answer 3

biological catalysts > facilitates chem rxns

Question 4

lingual lipase

Answer 4

breaks up fat

Question 5

salivary amylase

Answer 5

breaks up carb

Question 6

bolus travels down:

Answer 6

1. pharynx
2. epiglottis
3. esophagus
4. passageway to lungs

Question 7

good moves into stomach via

Answer 7

lower esophageal sphincter

Question 8

hcl in stomach denatures…

Answer 8

protein

Question 9

pepsin (an enzyme) breaks down and fcns best in …?

Answer 9

protein (fcns best in acidic environment)

Question 10

gastron

Answer 10

hormone secreted by stomach mucosa that stimulates secretion of gastric juices

Question 11

small and large intestine parts

Answer 11

• duodenum
• Jejunum
• Ileum
• Lrg intest

Question 12

duodenum

Answer 12

more digestion via enzymatic action (and some absorption)

Question 13

jejunum

Answer 13

digestion’s cont LOTS of absorption

Question 14

ileum

Answer 14

absorption cont

Question 15

lrg intest

Answer 15

food particles not digested & absorber are passed in to LI

Question 16

bile emulsifies..

Answer 16

fat molecule and breaks them into small droplets that mix well w water

Question 17

pancreas produces

Answer 17

bicarbonate ions to neutralize the acid in the chyme

Question 18

protease enzyme breaks down

Answer 18

protein

Question 19

where do nutrients go?

Answer 19

into BLOODSTREAM then transported to organs & tissues around body