ciculatorysystem

• the heart is an

  organ

  
• the circulatory system is an example of an

  organ system

  
• the circulatory system contains

  blood vessels

  A) lungs

  B) pulmonary artery

  C) left atrium

  D) left ventricle

  E) aorta

  F) capilarries

  G) vena cava

  H) right ventricle

  I) right atrium

  J) pulmonary vein

  
• the heart has how many chambers

  4

  
• the heart is needed to sustain

  life

  
• the heart pumps blood

  across the body

  
• the heart pumps oxygenated blood and

  deoxygenated blood

  A) vena cava

  B) right atrium

  
• oxygenated blood comes from the

  lungs

  
• the heart has how many halves

  two

  A) left ventricle

  B) right ventricle

  C) vena cava

  D) pulmonary vein

  E) left atrium

  F) aorta

  
• the walls of the left ventricle are thicker because

  oxygenated blood flows with excess pressure

  
• artificial pacemakers are used to

  correct irregularities in the heart rate

  
• valves help prevent the

  back flow of blood