Importance of Blood

• Blood is a crucial component of the body.
• Loss of blood is typically a negative sign.

Composition of Blood

1. Components

   • Plasma
   • Red Blood Cells (RBCs)
   • White Blood Cells
   • Platelets

2. Focus on Red Blood Cells (RBCs)

   • Also known as erythrocytes.
   • Approximately 5 million RBCs in a single drop of blood.
   • RBCs have a lifespan of 120 days.
   • The body produces 2.5 million new RBCs every second.

Function of Red Blood Cells

• Primary Function: Transport oxygen throughout the body.
  • Oxygen is essential for aerobic respiration and energy release.
  • RBCs pick up oxygen from the lungs to deliver it to other cells.

Special Adaptations of Red Blood Cells

1. Biconcave Disc Shape

   • Increases surface area for quick oxygen absorption.

2. Lack of Nucleus

   • Maximizes space for carrying oxygen.

3. Contain Hemoglobin

   • Binds with oxygen to form oxyhemoglobin.
   • Releases oxygen to respiring tissues.
   • Hemoglobin gives blood its red color.

Importance in Health

• RBCs are critical but just one part of the blood.
• Malaria is a disease that attacks red blood cells, highlighting their importance.

Interactive Element

• Question posed: How many RBCs made in the last two minutes?
  • Answer: 300 million cells.

Conclusion

• Red blood cells are vital for oxygen transport and overall health.
• More lessons are available on other components of blood.

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