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MSD Manual
Consumer Version
HEALTH TOPICS
HEALTHY LIVING
SYMPTOMS
EMERGENCIES
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COMMENTARY
ABOUT US
HEALTH TOPICS
HEALTHY LIVING
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Quick Facts: Blood Disorders
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Biology of Blood
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Biology of Blood
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Overview of Blood
What does blood do?
What is in blood?
Plasma
Red blood cells
White blood cells
Platelets
What problems can develop in your blood?