Select a Topic About Blood 56 Facts About Blood and Blood Donation Got Questions About Blood? Blood Cells Needing Blood Blood Safety Blood History Test Your Knowledge About Blood Return to About Blood Introduction

1. The main function of these cells is to defend
   the body against infection.
   Select Your Answer Red Blood Cells White Blood Cells Platelets
   
   
2. These cells play an essential role in the blood
   clotting process.
   Select Your Answer Red Blood Cells White Blood Cells Platelets
   
   
3. These blood cells carry oxygen to tissues through
   out the body.
   Select Your Answer Red Blood Cells White Blood Cells Platelets
   
   
4. How many blood cells in the human body
   die each second.
   Select Your Answer 500,000 100,000 to 250,000 2 Million
   
   
5. What is the name of the process that generates
   new red blood cells.
   Select Your Answer Hemoglobin Oxyhemoglobin Erythropoiesis
   
   
6. What is the life span of red blood cells.
   Select Your Answer 7 to 10 days 80 to 120 days 6 to 8 months

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