A bacterium is phagocytosed into a phagosome.  The phagosome then fuses with:

Name these cells in order from left to right (1 to 4):

Which cell type is often mobilised in large numbers from the bone marrow during infection?

In class you will count the number of cells in a blood sample.  The formula to calculate the number of cells/ml is:

If you had a blood sample and diluted 50 μl of your sample in 150 μl of white cell diluting fluid, and then counted the cells on a haemocytometer, counting:

• 89 cells in square A
• 102 cells in square B
• 97 cells in square C
• 99 cells in square D

What number of cells/ml do you have in your sample?  Report as a whole number, using standard notation (e.g. 4300 instead of 4.3 × 10³).

In class you will count the number of cells in a blood sample.  The formula to calculate the number of cells/ml is:

If you had a blood sample and diluted 20 μl of your sample in 80 μl of white cell diluting fluid, and then counted the cells on a haemocytometer, counting:

• 89 cells in square A
• 102 cells in square B
• 97 cells in square C
• 99 cells in square D

What number of cells/ml do you have in your sample?  Report as a whole number, using standard notation (e.g. 4300 instead of 4.3 × 10³).

In class you will count the number of cells in a blood sample.  The formula to calculate the number of cells/ml is:

If you had a blood sample and diluted 20 μl of your sample in 80 μl of white cell diluting fluid, and then counted the cells on a haemocytometer, counting:

• 76 cells in square A
• 70 cells in square B
• 67 cells in square C
• 86 cells in square D

What number of cells/ml do you have in your sample?  Report as a whole number, using standard notation (e.g. 4300 instead of 4.3 × 10³).

What is another name for white blood cells?

When looking at a blood smear, which cell is the largest?

In Part B of this exercise you will need to make a 1:20 dilution of sheep blood in white cell diluting fluid, to a total of 1 ml.  You need to use 50 μl of sheep blood cells.  How much white cell diluting fluid in μl do you need to use? (You do not need to include units in your answer.)

(Hint: 1 ml is equal to how many μl?)