Which row correctly identifies the parts labelled 1, 2 and 3?

16. Step 1: Identify the layers of the tooth shown in the longitudinal section. Part 1 is the outermost layer of the crown, which is the enamel*. Part 2 is the layer beneath the enamel, which is the dentine*. Part 3 is the innermost soft tissue, which is the pulp* cavity. Step 2: Match these identifications with the given options. Option B correctly identifies 1 as enamel, 2 as dentine, and 3 as pulp. B 17. Step 1: Understand what coronary heart disease is. Coronary heart disease is a condition where the blood vessels that supply blood to the heart muscle itself become narrowed or blocked. These vessels are called coronary arteries. Step 2: Examine the diagram of the heart and identify the labeled parts. A points to the aorta. B points to the pulmonary artery. C points to the blood vessels running over the surface of the heart muscle, which are the coronary arteries*. D points to the left ventricle. Step 3: Determine which labeled part corresponds to the coronary arteries. Part C represents the coronary arteries. C Last free one today — make it count tomorrow, or type /upgrade for unlimited.