EduNinjaFig. 1.1 and Fig. 1.2 show two images of villi.
Fig. 1.1 shows a surface view of many villi viewed through a scanning electron microscope.
Fig. 1.2 shows a section of one villus viewed through a light microscope.
Fig. 1.1
Fig. 1.2
Villi are found in the small intestine.
State the function of villi.
Identify and describe two of the labelled components of a villus.
Use the letters in Fig. 1.2 in your answer.
Fig. 1.1 shows several villi from the ileum, which is part of the small intestine.
State the name of one other part of the small intestine.
Fig. 1.1
Fig. 1.2 shows the tip of a villus in more detail.
Fig. 1.2
The epithelial cells of the villi absorb nutrients by diffusion and active transport.
Explain the importance of the microvilli shown in Fig. 1.2.
Fig. 1.1 shows a lacteal in the centre of each villus.
Describe the roles of lacteals.
Fig. 1.1 is a photomicrograph showing a surface view of many villi in the small intestine.
Fig. 1.1
State the function of villi.
Describe the structure of a villus.
Fat is a necessary component of the human diet.
Explain how the products of fat digestion are transported from Q to the rest of the body.
One possible effect of too much fat in the diet is coronary heart disease.
Water is a very important molecule for all living organisms.
State the name of the organ in humans where most water is absorbed.
The diagram shows the human alimentary canal.
In which structure is most glucose absorbed into the blood?
The small intestine is lined with many villi and is adapted to absorb glucose.
Fig. 2.1 shows two villi from the lining of the small intestine.
Fig. 2.1
Describe and explain how the structure of a villus is adapted for its function.
Lacteals are part of the lymphatic system.
State where in the body lacteals are found.
Describe the role of lacteals.
The diagram shows the digestive system.
Which part absorbs the most water?
Emulsification of fats occurs in the alimentary canal.
State the name of the structure in the villi where digested fats are absorbed.