Question 18N.3.HL.TZ0.18
| Date | November 2018 | Marks available | [Maximum mark: 10] | Reference code | 18N.3.HL.TZ0.18 |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain, Outline, State | Question number | 18 | Adapted from | N/A |
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]
small intestine ✔
Explain how components of bile are produced by the liver.
[3]
a. hemoglobin «from red blood cells» broken down into heme and globin ✔
b. iron removed from heme ✔
c. «remainder of» heme group transformed to bilirubin ✔
d. «surplus» cholesterol is converted to bile salts ✔
e. bilirubin and bile salts form bile ✔
The diagram shows the emulsion and absorption of a fat globule in the gut.
Outline a function of fats in the body.
[1]
a. use as energy source «for cellular respiration»
OR
«long term» energy storage ✔
b. fat tissue for «heat» insulation ✔
c. protects axons by myelin sheath
OR
other function of fats ✔
Accept first function written only
Explain how epithelial cells in the gut are adapted for absorption.
[2]
a. microvilli/brush border to increase surface area ✔
b. numerous mitochondria for energy for active transport ✔
c. have transport proteins for specific nutrients ✔
eg: glucose, amino acids
d. single layer of cells/short distance allowing for diffusion ✔
Explanation must be included for each characteristic
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.
[3]
Award [1] for each correct row
Award the mark only for rows containing two correct answers, ie: no blanks accepted