Anatomy & Physiology › Section P · Blood › Topic P.3
Leukocytes and platelets
Leukocytes are the blood's defenders, five kinds of cell that use the bloodstream as a road to wherever infection or damage appears. Platelets, fragments shed by giant marrow cells, are the first responders when a vessel is cut.
In this topic
- What makes leukocytes different
- Two groups and five types
- The granulocytes
- The agranulocytes
- Worked example: from percentages to counts
- Leukocyte counts in health and disease
- Platelets: fragments with a job
- Worked example: platelet turnover
- What platelets do
- Common mistakes to avoid
- Key takeaways
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