The options below show the names of three blood vessels from the systemic circulation of a mammal:
The table below gives structural measurements for these three blood vessels. Complete the table by identifying which blood vessel belongs to each row.
| Name of blood vessel | Diameter of the lumen (mm\text{mm}mm) | Thickness of the vessel wall (mm\text{mm}mm) |
|---|---|---|
| (1) | 7.2 | 0.6 |
| (2) | 0.007 | 0.0008 |
| (3) | 4.8 | 1.3 |
Which of these three blood vessels carries blood under the highest hydrostatic pressure away from the heart towards the lower limb?
Which of these three blood vessels contains pocket valves along its length to prevent the backflow of blood against gravity?
Identify which of these blood vessels is adapted for the exchange of substances, and explain how its wall structure facilitates this function.
