The circulatory system/blood vessels

• Circulatory System


  Blood Vessels
• Blood Vessels are Designed for Their Function
• ARTERY


  Carries blood away from the heart
• CAPILLARY


  Vessels in the tissues
• VEIN


  Carries blood back to the heart
• Arteries


  • Carry blood under pressure
• Arteries branch into smaller arteries
• Arteries are adapted to the size of the blood vessel
• Capillaries are really small
• Capillaries


  • Allow substances to diffuse in and out of the body tissues
• Capillaries are only one cell thick
• Veins


  • Take blood back to the heart
  • Have valves to help keep blood flowing in the right direction
  • Have lower pressure than arteries
• Calculating rate of blood flow


  Divide volume of blood by time
• The human body contains about 60,000 miles of blood vessels
• Veins are adapted to carry blood back to the heart