6.2 Practice problems
A researcher purified some platelets from human blood. She then added an aliquot of this suspension to a haemocytometer (Figure 6.7). Estimate the platelet concentration (cells ml–1) of her suspension. The haemocytometer has a depth of 0.1 mm.
- From your knowledge of erythrocytes, estimate the size (in µm) of the leukocyte in the micrograph (Figure 6.8). What type of leukocyte do you think it is?
![An actual micrograph showing one of the outer corner squares from a haemocytometer containing purified human platelets.](https://oercollective.caul.edu.au/app/uploads/sites/58/2023/01/image22.png)
![A photomicrograph of an unknown leukocyte showing a lot of granulation. The leukocyte is around twice the diameter of neighbouring erythrocytes.](https://oercollective.caul.edu.au/app/uploads/sites/58/2023/01/image23.jpeg)