(a(i))[1]
Identify the type of tooth displayed in the diagram.
(a(ii))[1]
Name the outermost layer of the tooth.
(a(iii))[4]
Explain how the tooth and the salivary gland each aid digestion in different ways.
(b(i))[4]
The stomach wall makes several substances used in digestion. Name two of these substances and explain how each takes part in digestion.
(b(ii))[1]
A hormone named gastrin causes cells in the stomach wall to release the substances used in digestion. Some gastrin is made in the duodenum. State how this gastrin gets to the stomach.