The heart

• The three parts of the circulatory system are the blood, the blood vessels, and the heart.
• Right Atrium


  what?

  
• On each side of the heart, the atrium and ventricle are separated by a valve, which prevents the blood from flowing backwards.
• Left Ventricle


  What is the name of the chamber labelled A in this diagram?

  
• The _______ ventricle has thicker walls because it has to pump blood all the way around the body.

  Left
• Which blood vessel carries deoxygenated blood from the heart to the lungs?

  Pulmonary artery
• Body tissues ➔ vena cava ➔ right atrium ➔ right ventricle ➔ pulmonary artery ➔ lungs ➔ pulmonary vein ➔ left atrium ➔ left ventricle ➔ aorta ➔ body tissues
• Which blood vessel carries oxygenated blood from the heart to the body?

  Aorta
• The walls of the atria contract, pushing blood into the relaxed ventricles.

  The walls of the ventricles contract, pushing blood out of the heart. At the same time, more blood will enter the now-relaxed atria.
• Pacemaker cells are found in which chamber of the heart?

  Right Atrium
• Which statement is always true regarding arteries?

  They carry deoxygenated blood

  They carry oxygenated blood

  They carry blood away from the heart

  They carry blood towards the heart

  They carry blood away from the heart
• Which statements is always true for veins?

  They usually carry oxygenated blood

  They usually carry deoxygenated blood

  They carry blood away from the heart

  They carry blood towards the heart

  They carry blood towards the heart
• The coronary arteries supply the heart muscle with oxygen and nutrients.