A&P - Chapter 27 (Part 5) Flashcards
What is another word for WBC?
Leukocytes
What is the general function of WBCs?
Defence/immunity
What are 2 categories of WBCs?
- Granulocytes
2. Agranulocytes
Granulocytes
Granules in the cytoplasm
Agranulocytes
No granules in the cytoplasm
What are 3 types of granular leucocytes?
- Neutrophils
- Eosinophils
- Basophils
What are 2 types of agranular leukocytes?
- Lymphocytes
2. Monocytes
What is the most numerous type of WBC?
Neutrophils
- 65%
What do neutrophils do?
They are very active phagocytes against pathogens
What are neutrophils attracted to?
Damaged cells at infection sites
How are neutrophils attracted to damaged cells?
By chemotaxis
Where are eosinophils most abundant?
In mucus membranes
What kind of phagocytes are eosinophils?
Weak
What does eosinophils do?
Serves protection against certain parasitic infections
What do basophils secrete? (2)
- Heparin
2. Histamine
Heparin
A strong anticoagulant
When is histamine released?
During inflammatory reactions
Lymphocytes
Smallest WBC
What is the 2nd most numerous component of blood?
Lymphocytes
- 25%
What are 2 types of lymphocytes?
- B lymphocytes
2. T lymphocytes
What do B lymphocytes do?
They produce antibodies
What do T lymphocytes do?
They directly attack foreign cells
What does a differential WBC count test do?
It gives the proportions of each type of WBC as a percentage of the total WBC count
What are 3 WBC disorders that can be detected from a differential WBC count test?
- Leukopenia
- Leukocytosis
- Leukemia
Leuko
White
Leukopenia
Abnormally low WBC count
Leukocytosis
Abnormally high WBC count
What is the most common WBC disorder?
Leukocytosis
What is leukocytosis usually result from?
Bacterial infections
Leukemia
Blood cancer
- WBC count > 100,000 mm^3
