Blood and heart

• The heart is made up of cardiac muscle. The function of the heart is to pump blood around the body to supply the cells with oxygen for respiration. It does this by contracting the muscle.
• The heart is made up of four chanbers.

  The Upper two chambers are called the atria, atrium (plural)

  The Lower two chambers are called the ventricle, ventriculum (plural)
• The Circulatory system

  • arterys carry blood away from the heart
  • veins carry blood back in to the heart
  • blood carries oxygen around the body
  • capillaries join the large vessels that leave and enter the heart together
• 7% of our body mass is our blood
• Main components of blood

  • Plasma
  • Red Blood cells
  • White Blood cells
  • Platelets
• Hemoglobin


  The chemical in our red blood cells that carries oxygen
• Red Blood Cells

  • Made in the Bone Marrow
• Red blood cells

  • They contain no nucleus
  • They are a curved disc shape to absorb as much oxygen as possible
• The artery in the wrist is called the radial artery
• The artery in the neck is called the carotid artery
• veins carry blood into the heart
• Arteries carry blood away from the heart