Hemocytometer MCQ Quiz Questions and Answers

1. A hemocytometer is a special counting chamber designed for counting _______.

Bones

Blood cells

Nerves

Pulse rate

A hemocytometer is a specially designed counting chamber used for counting blood cells. It is commonly used in laboratories and medical settings to determine the number of red blood cells, white blood cells, and platelets present in a given sample. This tool allows for accurate and precise cell counting, which is crucial in diagnosing and monitoring various blood-related conditions such as anemia, infections, and leukemia.

Explanation

A hemocytometer is a specially designed counting chamber used for counting blood cells. It is commonly used in laboratories and medical settings to determine the number of red blood cells, white blood cells, and platelets present in a given sample. This tool allows for accurate and precise cell counting, which is crucial in diagnosing and monitoring various blood-related conditions such as anemia, infections, and leukemia.

2. Where are white blood cells counted?

The middle square

The 3 left squares and 3 right squares

The squares in the corners

The 3 top squares and 3 bottom squares

White blood cells are counted in the squares in the corners. This is because the corners of the grid are less likely to have overlapping cells, allowing for a more accurate count. Additionally, counting the cells in the corners ensures that all areas of the grid are accounted for, providing a comprehensive assessment of the white blood cell count.

Explanation

White blood cells are counted in the squares in the corners. This is because the corners of the grid are less likely to have overlapping cells, allowing for a more accurate count. Additionally, counting the cells in the corners ensures that all areas of the grid are accounted for, providing a comprehensive assessment of the white blood cell count.

3. What is the dilution factor for red blood cells?

1:300

1:200

1:100

1:50

The dilution factor for red blood cells is 1:200. This means that one part of the red blood cells is diluted with 200 parts of a diluent.

Explanation

The dilution factor for red blood cells is 1:200. This means that one part of the red blood cells is diluted with 200 parts of a diluent.

4. What squares are used when counting red blood cells?

The corner squares

The middle top square and middle bottom square

The 3 squares on the left and the 3 squares on the right

The middle square

The question is asking which squares are used when counting red blood cells. The correct answer is the middle square. This suggests that when counting red blood cells, only the middle square is considered.

Explanation

The question is asking which squares are used when counting red blood cells. The correct answer is the middle square. This suggests that when counting red blood cells, only the middle square is considered.

5. Hemoglobin takes up what number of molecules of oxygen?

1

2

3

4

Hemoglobin takes up four molecules of oxygen.

Explanation

Hemoglobin takes up four molecules of oxygen.

6. What is the dilution factor for white blood cells?

1:100

1:50

1:20

1:10

The dilution factor for white blood cells is 1:20. This means that the sample is diluted 20 times before analysis. Dilution is often done to reduce the concentration of a substance in a sample, making it easier to work with or analyze. In this case, the white blood cells are being diluted to a ratio of 1 part sample to 20 parts diluent.

Explanation

The dilution factor for white blood cells is 1:20. This means that the sample is diluted 20 times before analysis. Dilution is often done to reduce the concentration of a substance in a sample, making it easier to work with or analyze. In this case, the white blood cells are being diluted to a ratio of 1 part sample to 20 parts diluent.

7. When counting white blood cells, what is the volume of each square?

0.02mm³

0.01mm³

0.2mm³

0.1mm³

The volume of each square when counting white blood cells is 0.1mm³.

Explanation

The volume of each square when counting white blood cells is 0.1mm³.

8. What is the rule used when counting cells in a hemocytometer?

North East Rule

Counting Rule

South West Rule

North West Rule

The North West Rule is used when counting cells in a hemocytometer. This rule involves counting the cells that are present in the four corner squares of the hemocytometer grid. It is a commonly used method for cell counting in laboratory settings.

Explanation

The North West Rule is used when counting cells in a hemocytometer. This rule involves counting the cells that are present in the four corner squares of the hemocytometer grid. It is a commonly used method for cell counting in laboratory settings.

9. What is the volume of one triple-lined square?

0.02mm³

0.002mm³

0.004mm³

0.04mm³

The volume of one triple-lined square is 0.004mm³.

Explanation

The volume of one triple-lined square is 0.004mm³.

10. Why are several squares on the hemocytometer counted rather than just one?

It is more representative.

It is more fair.

It makes the results more reliable.

It is more valid.

Counting several squares on the hemocytometer is more representative because it allows for a larger sample size. By counting multiple squares, the results can better reflect the overall concentration of cells in the sample. This reduces the likelihood of obtaining skewed or inaccurate results that may occur if only one square is counted. Therefore, counting several squares provides a more comprehensive and reliable assessment of the cell concentration in the sample.

Explanation

Counting several squares on the hemocytometer is more representative because it allows for a larger sample size. By counting multiple squares, the results can better reflect the overall concentration of cells in the sample. This reduces the likelihood of obtaining skewed or inaccurate results that may occur if only one square is counted. Therefore, counting several squares provides a more comprehensive and reliable assessment of the cell concentration in the sample.