| Date | November 2009 | Marks available | 3 | Reference code | 09N.3.HL.TZ0.14 |
| Level | Higher level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Outline | Question number | 14 | Adapted from | N/A |
Question
The electron micrograph below shows cells from the intestine.
In the electron micrograph above, state the name of the
(i) structure labelled X.
(ii) type of cells labelled Y.
Define hormone.
Outline the circulation of blood through liver tissue.
Markscheme
(i) microvilli/microvillus
(ii) epithelial cell/enterocyte
chemical (messengers) secreted by (endocrine) glands;
into the blood / transported by the blood;
act on target organs/cells;
hepatic artery carries oxygenated blood;
hepatic portal vein carries blood from gut/deoxygenated blood;
blood from hepatic portal vein and hepatic artery mix;
flows through sinusoids;
hepatic vein carries blood away from liver;
Examiners report
(i) Too many candidates wrote villus (or villi) instead of microvillus (or microvilli) here.
(ii) Most candidates successfully answered epithelial cell.
