Control of the heart rate

• What is one of the functions of the circulatory system in humans?

  To transport substances
• What is the role of the heart in the circulatory system?

  • Pumps blood throughout the body
  • Supplies cells with nutrients and oxygen
  • Removes waste products from cells
• What are the upper chambers of the heart called?

  Atria
• What do specialized cells in the right atrium do?

  They generate electrical signals that make the heart contract
• What is a natural pacemaker?

  A group of specialized cells that generates electrical impulses
• How does the wave of contraction spread across the heart?

  It spreads from the left atrium to the ventricles
• What can happen if the rhythm of the heart's natural pacemaker is disrupted?

  The heart can beat abnormally
• What is an artificial pacemaker?

  A medical device that uses electrical impulses to regulate heartbeats
• Where is an artificial pacemaker implanted?

  In a person's chest
• How does an artificial pacemaker work?

  It sends out regular, adjustable electrical impulses to produce normal contractions
• What is the fitting of artificial pacemakers considered in the UK?

  One of the most common types of heart surgery
• What are the types of heart surgery related to artificial pacemakers?

  • Fitting of artificial pacemakers
  • Repairing heart valves
  • Bypass surgery
• What is the role of the blood vessels in the circulatory system?

  To transport blood throughout the body
• What is the significance of the heart's electrical signals?

  They coordinate the contraction of the heart muscle
• How do artificial pacemakers differ from natural pacemakers?

  Artificial pacemakers are devices, while natural pacemakers are groups of specialized cells