Circulatory system

• what type of walls do arteries have

  thick , elastic muscular walls
• why do arteries need thick elastic walls

  to withstand high pressure as they take blood from the heart
• what type of walls do veins have

  thin, less elastic muscular walls and one - way valve
• why do veins have thin , less elastic walls

  because blood is under lower pressure returning to the heart
• what ARE CAPILLARIES

  tiny , blood vessels that branch into all tissues
• why do capillaries have thin walls 


  to allow substances to diffuse in and out from them easily
• name the 4 chambers of the heart

  right atrium

  left atrium

  right venticle

  left venticle
• which chamber pumps blood to the rest of the body

  left venticle
• what does your cells need for respiration

  oxygen and glucose
• what is the waste product of respiration

  carbon dioxide
• what other blood vessels ('s) does your capillaries join

  join your arteries then your veins
• why is blood under low pressure in your veins

  because some has been lost as it travelled around your body
• why does your veins have one - way valves

  so blood doesn't travel backwards
• where does the artery carry blood

  away from the heart
• why is the artery made up of elastic walls

  because it allows a pulse of blood to travel along when your heart beats
• what are the three types of blood vessels

  veins , artery's , capillaries
• what is the circulatory system made up of

  heart , all the blood vessels in the body which carry cells and substances to all its parts
• what type of organ is the heart

  a muscular organ
• where does the heart pump blood first

  Blood goes from the heart , lungs , back to heart , the to the rest of the body