Chapter 9: Circulation and Immunity

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Chapter 9 Circulation and Immunity

• Section 1 Blood
• Section 2 Circulation
• Section 3 Immunity

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Functions of Blood

• Blood has four important functions.
• Blood carries oxygen from your lungs to all your
  body cells.
• Blood carries waste products from your cells to
  your kidneys to be removed.

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• Blood transports nutrients and other substances
  to your body cells.
• Cells and molecules in blood fight infections and
  help heal wounds.

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• Blood is a tissue made of plasma, red and white
  blood cells, and platelets

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PLASMA

• The liquid part of blood, which is made up mostly
  of water, is called plasma.
• Nutrients, minerals, and oxygen are dissolved in
  plasma so that they can be carried to body cells.
• It contains hemoglobin (HEE muh gloh bun), which
  is a molecule that carries oxygen and carbon
  dioxide.

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BLOOD CLOTTING

• When you cut yourself, platelets stick to the
  wound and release chemicals.
• These reactions cause threadlike fibers called
  fibrin to form a sticky net.

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BLOOD TYPES

• People can inherit one of four types of blood A,
  B, AB, or O.
• If the wrong type is given,then the person could
  die!

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Question 1 Which best describes what this diagram
of the makeup of blood shows?

• A. Blood contains both cells and liquids.
• Plasma is the most important part of blood.
• C. Plasma is the most important part of blood.
• D. The number of white blood cells shown is
• too low.