The table below shows the average speed of blood flow in three different blood vessels of a mature giraffe.
| Blood vessel | Speed of blood flow (cm⋅s−1)(\text{cm}\cdot\text{s}^{-1})(cm⋅s−1) |
|---|---|
| Carotid artery | 42.042.042.0 |
| Brain capillary | 0.080.080.08 |
| Jugular vein | 14.014.014.0 |
Blood travels a distance of 1.89 m1.89\text{ m}1.89 m through the carotid artery from the heart to the brain. Calculate the time taken, in seconds, for blood to flow this distance. Show your working.
Explain how the speed of blood flow in the brain capillary is highly adapted to facilitate efficient exchange of nutrients and respiratory gases.
