Lecture 40- Nonfermentative Digestion and Absorption

Question 1

What are the circular constrictions found in the intestines

Answer 1

Plicae circulares

Question 2

Microvilli prjections form th

Answer 2

Brush border

Question 3

What connects the apical part of enterocytes

Answer 3

Tight junctions

Question 4

What part of the small intestine is made of glycoproteins that digests disaccharides and small proteins

Answer 4

Glycocalyx

Question 5

What is the tin layer of water that flows over the intestinal surface to prevent lipid absorption

Answer 5

Unstirred water layer

Question 6

What is the main mechanism of macrobutrient breakdown

Answer 6

Hydrolysis

Question 7

What type of bonds are present in starch

Answer 7

alpha 1-4 glycosidic bonds

Question 8

What bond is present in fiber that cannot be digested without fermentation

Answer 8

beta 1-4 glycosidic bonds

Question 9

Does amylase finction in lumenal digestion of membranous digestion

Answer 9

Lumenal

Question 10

What peptide form is more easily absorbed

Answer 10

di and tripeptides

Question 11

What section of the GI system digests the most fat?

Answer 11

The small intestine

Question 12

4 phases of lipid assimilation

Answer 12

Emulsification
Hydrolysis
Micelle formation
Absorption

Question 13

What bile micelle quality allows it to pass through the unstirred water layer?

Answer 13

Hydrophilic outside

Question 14

Lipids packaged within enterocytes with cholesterol

Answer 14

Chylomicron

Question 15

Where do chylomicrons travel to

Answer 15

Lymphatic circulation, then dumped into the vena cava

Question 16

What disease is caused bypancreatic acinar atrophy resulting in fat in feces and lack of absorbion

Answer 16

Exocrine pancreatic insufficiency

Question 17

Glucose is passively absorbed into the apical portion of the cell using cotransport with

Answer 17

Na

Question 18

In enteric cells-
H+ is excreted to absorb-
Bicarb is excreted to absorb-

Answer 18

Na+ and CL-

Question 19

Where do monogastrics produce B12

Answer 19

The colon (not absorbed)

Question 20

Where is most B12 absorbed

Answer 20

Ileum

Question 21

What transports B12

Answer 21

Intrinsic factor in the intestins, transcobalamin systemically