Practise absorption in the small intestine by locating villi, explaining microvilli and thin epithelium, and tracing nutrients into capillaries or lacteals.
Fig. 6.1 is a diagram of a villus.
Fig. 6.1
Draw labels and label lines on Fig. 6.1 to identify a capillary and a lacteal.
State the part of the digestive system where villi are located.
State the function of the lacteal.
Describe the pathway taken by the products of protein digestion from the villi to the liver.
The diagram shows part of the alimentary canal.
Where is most water absorbed?
Fig. 1.1 shows several villi from the ileum, which is part of the small intestine.
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.