human circulatory system

• What type of system is the human circulatory system?

  A closed double system
• What does the human circulatory system consist of?

  A pump, valves, and vessels
• What is the function of the heart in the circulatory system?

  To sustain high pressure
• What do valves control in the circulatory system?

  The direction of blood flow
• What is the role of blood vessels in the circulatory system?

  To distribute blood
• What are the three types of blood vessels?

  • Arteries
  • Veins
  • Capillaries
• What is the function of arteries in the circulatory system?

  To transport blood from the heart
• What is the function of veins in the circulatory system?

  To transport blood back to the heart
• What is the function of capillaries in the circulatory system?

  To facilitate exchange of substances
• How do arteries and veins differ in structure?

  Arteries have thicker walls than veins
• What is the role of the endothelium in blood vessels?

  To provide a smooth lining
• What is the function of the middle layer of blood vessels?

  To regulate blood flow and pressure
• What is the outer layer of blood vessels made of?

  Collagen fibers
• What is the function of the outer layer of blood vessels?

  To provide structural support
• What are the layers of blood vessels?

  1. Endothelium (inner layer)
  2. Middle layer (smooth muscle)
  3. Outer layer (collagen fibers)