Blood

• What are the four main components of blood?

  Red blood cells, white blood cells, platelets, plasma
• What is the primary function of red blood cells?

  To carry oxygen from the lungs to the body
• How does the shape of red blood cells aid their function?

  It provides a large surface area for oxygen absorption
• What substance do red blood cells contain that allows them to carry oxygen?

  Haemoglobin
• Why do red blood cells not have a nucleus?

  To leave more space for carrying oxygen
• What is the role of white blood cells?

  To defend against infections
• What are lymphocytes?

  White blood cells that produce antibodies
• What do phagocytes do?

  They change shape to engulf microorganisms
• Do white blood cells have a nucleus?

  Yes, they have a nucleus
• What is the function of platelets?

  To help blood clot
• How do platelets contribute to wound healing?

  They stop blood loss and prevent infections
• What is plasma in the context of blood?

  The liquid that carries everything in blood
• What does plasma carry in the blood?

  Red and white blood cells, platelets, nutrients
• What are some waste products carried by plasma?

  Carbon dioxide and urea
• What is urea?

  A waste product of protein breakdown
• Why is it important for platelets to function properly?

  To prevent excessive blood loss and infections