Deck 7: Absorption and Motility in the Small Intestine

Question 1

Choose a single incorrect answer about absorption from small intestine:

A)Gastric HCL help iron absorption
B)K+ions are absorped passively.
C)HCO3- ions are absorbed passively.
D)none

Answer 1

HCO3- ions are absorbed passively.

Question 2

The absorptive surface area of small intestineis over:

A)2.8m
B)250m2
C)7m
D)50m2

Answer 2

250m2

Question 3

Intestinal motility help absorption from small intestine by all the following except:

A)Increase blood and O2 supply.
B)Increase lymph flow.
C)Increase osmotic pressure.
D)Increase contact of food with mucosa.

Answer 3

Increase osmotic pressure.

Question 4

The following statement about calcium absorption from small intestine are true except:

A)It occurs by active transport.
B)It requires vit. D and parathormone.
C)It occours by passive diffusion from upper small intestine.
D)It is decreased by excess phosphate and oxalate in food.

Question 5

The following are true statement about fat absorption from small intestine except:

A)It is helped by bile salts.
B)Glycerol and short chain FAs are absorped passively.
C)Deficiency of fat absorption leads to poor absorption of VIT.B complex.
D)Chylomicrons are extruded into Lacteal laterals by exocytosis.

Question 6

The transport of glucose across intestinal mucosa is directly dependent Upon the following except:

A)Na concentration in intestinal lumen.
B)Plasma insulin.
C)Inhibitors of energy metabolism.
D)none

Question 7

Absorption of fat soluble vitamins require the following:

A)Bile.
B)Bile and chymotrypsine.
C)Bile and pancreatic amylase.
D)None of the above.

Question 8

The major site of absorption of VIT B12 is:

A)Duodenum.
B)Jujenum.
C)Colon.
D)Ileum.

Question 9

The following are true statement about absorption from small intestine except:

A)Hexose are absorped faster than pentose.
B)D amino acids are absorped better than L amino acids.
C)Glucose is absorped faster than fructose.
D)none

Question 10

The amount of water excreted in stool is about:

A)100mld
B)0.5Ld
C)0.4Ld
D)none

Question 11

Absorption of Na ions from small intestine occur by the following except:

A)Special Na channel.
B)Cotransported with Cl.
C)Cotrannsported with glucose and amino acids.
D)None of the above.

Question 12

Absorption of Cl- ions from small intestine occur by the following ways except:

A)2ry active transport.
B)1 ry active transport.
C)Passive diffusionparacellularly.
D)none

Question 13

All of the followings are absorped by Na dependent 2ry active transport except:

A)Glucose and galactose.
B)Amino acids.
C)VitaminC
D)VitaminB.12

Question 14

The following are true statement about iron absorption from small intestine except:

A)It is actively absorped from duodenum and jejunum.
B)Its absorption is decreased by tannin.
C)Its absorption is helped by vitamin C.
D)It is transported from the brush borderas Fe+3 or heme.

Question 15

Fructose is absorped from small intestine by :

A)Simple diffusion.
B)Facilitated diffusion.
C)Na+ dependent 2ry active transport.
D)none

Question 16

Pentose is absorped from small intestine by:

A)Simple diffusion.
B)Facilitated diffusion.
C)Na+ dependant 2ry active transport.
D)none

Question 17

Whole proteins may be absorped from small intestine by :

A)Pinocytsis.
B)Na+dependant 2ry active transport.
C)Facilitated diffusion.
D)none

Question 18

Vitamin D is absorped from small intestine as the absorption of :

A)Water soluble vitamins.
B)Glycerol.
C)Cholesterol.
D)Short chain fatty acids

Question 19

VitaminC is absorped from small intestine by:

A)Passive diffusion.
B)Na+ dependant 2ry active transport.
C)1ry active transport.
D)none

Question 20

Peristaltic contractions of small intestine are characterized by all of the followings except:

A)They are myogenic
B)They are due to local axon reflex
C)They are stimulated by gastro-enteric reflex
D)none

Question 21

The following reflexes inhibit small intestine motility except:

A)Peritoneo-intestinal
B)Reno-intestinal
C)Gastro-ileal.
D)Somato-intestinal.

Question 22

Rhythmic segmentation of small intestine is characterized by the following except:

A)It is due to local axon reflex.
B)It is myogenic.
C)Its frequency is determined by BER.
D)Its main function is to mix chyme with the digestive juice.

Question 23

Peristaltic waves in the small intestine are characterized by the following statement except:

A)They occur in response to distention of the wall.
B)Can be abolished by local application of coccaine
C)They are controlled primarily by extrinsic innervation
D)none

Question 24

Migration motor complex is characterized by the following except:

A)It starts in the stomach and spread to terminal ilium.
B)Occurs every1-1.5h.
C)It helps digestion of food
D)It prevents duodeno-gastric reflux.

Question 25

Peristaltic rush are characterized by the following except:

A)They are strong peristaltic contraction.
B)They occur normally.
C)they occur when there is intense irritation or distention of the small intestine.
D)They are intiated by reflexes involving the intrinsic and extrinsic nerves.