Solved: The diagram shows the emulsion and absorption of a fat globule in the gut. ... [IB Biology]

Question

HLPaper 3

The diagram shows the emulsion and absorption of a fat globule in the gut.

State the organ in the digestive system where this process is taking place.

[1]

Verified

Solution

small intestine $\checkmark$

Explain how components of bile are produced by the liver.

[3]

Verified

Solution

a. hemoglobin «from red blood cells» broken down into heme and globin $\checkmark$ b. iron removed from heme $\checkmark$ c. «remainder of» heme group transformed to bilirubin $\checkmark$ d. «surplus» cholesterol is converted to bile salts $\checkmark$ e. bilirubin and bile salts form bile $\checkmark$

Outline a function of fats in the body.

[1]

Verified

Solution

a. use as energy source «for cellular respiration» OR «long term» energy storage $\checkmark$ b. fat tissue for «heat» insulation $\checkmark$ c. protects axons by myelin sheath OR other function of fats $\checkmark$

Explain how epithelial cells in the gut are adapted for absorption.

[2]

Verified

Solution

a. microvilli/brush border to increase surface area $\checkmark$ b. numerous mitochondria for energy for active transport $\checkmark$ c. have transport proteins for specific nutrients $\checkmark$ d. single layer of cells/short distance allowing for diffusion $\checkmark$

In order to compare the absorption of fat and of glucose in the digestive system, state in the table, using yes or no, whether the processes occur.

Process	Fat	Glucose
Transported in micelles
Absorption mostly into lacteals
Transported from gut in blood

[3]

Verified

Solution

a. b. c.

Process | Fat | Glucose | $\checkmark$ Transported in micelles | yes | no | Absorption mostly into lacteals | yes | no | Transported from gut in blood | no | yes |

The diagram shows the emulsion and absorption of a fat globule in the gut.

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