B4.2 The Blood Vessels

• What is the structure of a capillary?

  Narrow and thin
• What is the function of an Artery?

  Transport blood away from the heart
• What makes up a double circulatory system?

  • A circuit that connects the heart to the body
  • A circuit that connects the heart to the lungs
• What is the function of a Vein?

  Transport blood to the heart
• What is the structure of a vein?

  • Thin Walls
  • Valves to stop backflow
• What is the structure of an Artery?

  Thick and Muscular
• What is the function of a capillary?

  To exchange substances between the blood and body cells