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The heart and cardiac cycle
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The heart and cardiac cycle

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  • 1. The Heart and Cardiac Cycle
  • 2. What Do We Remember?
    • Why is blood type AB+ the universal recipient?
    • What would happen if someone receives blood that is not compatible with their own?
    • What does plasma do?
    • What are the three layers of arteries?
    • What would happen if veins had no valves?
    • Why do veins have a lower blood pressure than arteries?
    • What blood vessels carry oxygen poor blood?
  • 3. The Heart
    • The pump that drives the cardiovascular system is the heart.
    • Drives blood down through your arms, legs, head and throughout every organ in your body.
    • Does not drive blood through the body in a circle, but more in a figure 8 pattern.
  • 4.
    • The heart pumps blood along 2 pathways in the body.
    • 1. The Pulmonary Circuit
    • 2. The Systemic Circuit
    • Pulmonary Circuit : Heart pumps blood to the lungs and back to the heart.
    • deoxygenated blood leaves heart  pulmonary artery  lungs  oxygenated blood enters pulmonary vein  heart
    • Systemic Circuit : Carries blood from the heart to the body organ systems and back to the heart.
    • oxygenated blood leaves heart  aorta  body systems  deoxygenated blood enters superior/inferior vena cava  heart
    • Whole circuit takes about 90 seconds.
  • 5.  
  • 6. The Heart
    • Consists of 4 chambers
      • Right and left atriums, and right and left ventricles
    • A 2 pump system
      • Right and left side of the heart
    • The septum separates the 2 sides of the heart and keeps oxygen rich blood from mixing with oxygen poor blood.
  • 7.  
  • 8. The 4 Chambers of the Heart
    • Atria (plural):
      • Upper chambers are the each is an atrium .
      • Right atrium and left atrium
      • The atria receive blood that is returning to the heart.
      • The blood is then transferred to ventricles
    • Ventricles:
      • Lower chambers of the heart
      • Right ventricle and left ventricle
      • The ventricles receive blood from the atria and pump blood from the heart
  • 9.  
  • 10. Valves in the Heart
    • Atrioventricular Valves
      • Separate atrium from ventricle
      • Tricuspid valve
      • Bicuspid (mitral) valve
    • Semilunar Valves
      • Monitor blood flow leaving the ventricles
      • Pulmonary valve (to the lungs)
      • Aortic valve (to the rest of the body).
    Valves of the Heart Video
  • 11. Right Lung Left Lung
  • 12. Systole and Diastole
    • Systole - contractions of the heart
      • 1) a 0.1 second contraction of the atria
        • Completely fills the ventricles with blood
      • 2) Followed by 0.3 second contraction of the ventricles
      • This closes atrioventricular valves and forces open the semilunar valves
      • Pumps blood into the large arteries
      • Blood also flows into the atria at this time while ventricles are contracted.
    • Diastole - entire heart is relaxed
      • Atrialventricular valves are open
      • Blood flows into all 4 chambers
    http:// www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_all.html The Movement of Blood Through the Heart
  • 13. Electrical System of the Heart Sinoatrial Node “ Pacemaker” Atrioventricular Node Start 1 2 3 4
  • 14. http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_electrical.html
  • 15. Questions
    • What are the four chambers of the heart?
    • The right side of the heart contains oxygen poor blood. True/False?
    • What chamber pumps the blood to the rest of the body?
    • What is the heart’s “pacemaker”?
    • Why might someone need an artificial pacemaker?
    • What does systole mean?
    • How would being scared affect your heart rate?
  • 16. Assignment:
    • Label the parts of the heart diagram
    • Using a flow chart, follow the flow of blood from the vena cava to the rest of the body.
    • Ex.
    • Right atrium ►Right Ventricle ►….
    • This will be handed in
  • 17.  

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