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Questions and Answers
Which of the following are types of granulocytes? (Select all that apply)
White blood cells (WBCs) do not contain a nucleus.
False
How long do red blood cells live?
120 days
Dead RBCs are removed and destroyed by fixed phagocytic macrophages in the ______ and ______.
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Which type of white blood cell can be subdivided into T cells, B cells, and NK cells?
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Match the following WBC types with their percentage in total WBC count:
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Study Notes
Normal Blood Cells
- A microscopic image shows normal blood cells.
Life Span
- Red blood cells (RBCs) have a life span of approximately 120 days.
- After 120 days, RBCs are removed from blood and destroyed by fixed phagocytic macrophages in the spleen and liver.
- Breakdown products, including heme and proteins, are recycled.
White Blood Cells (WBCs) or Leukocytes
- WBCs have a nucleus but do not contain hemoglobin (Hb).
- The total count of WBCs is between 4000-11000/mm3.
- WBCs are divided into two categories:
-
Granulocytes, which contain granules in their cytoplasm:
- Neutrophils (60-70%)
- Eosinophils (2-4%)
- Basophils (1%)
-
Non-granulocytes, which do not contain granules:
- Lymphocytes (20-25%)
- Monocytes (3-8%)
Leukocytes Classification
- WBCs are classified into two categories:
-
Agranular:
-
Lymphocytes (20-25%):
- T cells
- B cells
- NK cells
- Monocytes (3-8%)
-
Lymphocytes (20-25%):
-
Granular:
- Basophils (0.5-1%)
- Neutrophils (60-70%)
- Eosinophils (2-4%)
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Description
Learn about the structure and function of normal blood cells, including red and white blood cells, their life span, and components.
