The heart

• What is the primary function of the heart?

  The heart continuously pumps blood throughout the body.
• How does blood enter the heart?

  Blood enters the two atria from the vena cava and pulmonary artery.
• What happens when the atria contract?

  The atria contract, pushing blood into the ventricles.
• What is the role of the ventricles in the heart?

  The ventricles contract, pumping blood out of the pulmonary artery and the aorta.
• How does blood flow to the organs?

  Blood flows to the organs through arterioles and mini capillaries.
• What happens after blood flows to the organs?

  The blood flows again, and the whole cycle starts over.
• What type of blood does the heart rely on?

  The heart relies on oxygenated blood.
• What does the heart continuously provide?

  The heart continuously provides blood to the body.
• What does the heart warming and surrounding give it?

  It gives the heart the oxygenated blood it needs.
• Where is the pacemaker located?

  The pacemaker is located in the right atrium.
• How is the resting heart rate controlled?

  A small electric impulse acts as a pacemaker to control the resting heart rate.
• What does the electric impulse produced by the pacemaker do?

  It spreads to surrounding muscle cells, making them contract.
• What is an artificial pacemaker used for?

  An artificial pacemaker is used to control the heartbeat if the natural pacemaker doesn't work properly.
• What is an artificial pacemaker?

  It is a small device implanted under the skin with a wire going to the heart.
• How does an artificial pacemaker help the heart?

  It provides an electric current to help the heart beat regularly.
• What are the main functions of the heart in the circulatory system?

  • Pumps oxygenated blood throughout the body
  • Receives deoxygenated blood from the body
  • Maintains continuous blood circulation
• What is the process of blood circulation through the heart?

  1. Blood enters the atria from the vena cava and pulmonary artery
  2. Atria contract, pushing blood into ventricles
  3. Ventricles contract, pumping blood out through pulmonary artery and aorta
  4. Blood flows to organs via arterioles and capillaries
  5. Cycle repeats
• What is the role of the pacemaker in heart function?

  • Controls resting heart rate
  • Generates small electric impulses
  • Ensures regular heart contractions
• What are the differences between a natural and artificial pacemaker?

  Natural Pacemaker:

  • Located in the right atrium
  • Regulates heart rate naturally

  
  

  Artificial Pacemaker:

  • Implanted under the skin
  • Provides electric current to regulate heartbeat
• What is the primary function of the circulatory system?

  To transport food and oxygen to every cell in the body
• What are the two circuits of the circulatory system?

  1. Right side pumps deoxygenated blood to the lungs for oxygenation
  2. Left side pumps oxygenated blood to the rest of the body
• What does the right side of the heart do?

  Pumps deoxygenated blood to the lungs
• What happens to blood after it is oxygenated in the lungs?

  It returns to the heart
• What does the left ventricle do?

  Pumps oxygenated blood around all the organs in the body
• What occurs at the body cells regarding oxygen?

  The blood gives up its oxygen
• What happens to deoxygenated blood after it gives up its oxygen?

  It returns to the heart
• Describe the cycle of blood flow in the circulatory system.

  • Deoxygenated blood is pumped to the lungs
  • Blood gets oxygenated in the lungs
  • Oxygenated blood returns to the heart
  • Left ventricle pumps blood to the body
  • Blood gives up oxygen at body cells
  • Deoxygenated blood returns to the heart
  • Cycle restarts