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Conduction

Conduction. Cardiac Cycle. Pattern of: Systole: Contraction Diastole: Relaxation http://www.youtube.com/watch?v=rguztY8aqpk. Cardiac Cycle. What is meant by atrial systole? What is meant by ventracle diastole?. Cardiac Cycle. What do you hear when you listen to a person’s heart beat?

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Conduction

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  1. Conduction

  2. Cardiac Cycle Pattern of: • Systole: Contraction • Diastole: Relaxation • http://www.youtube.com/watch?v=rguztY8aqpk

  3. Cardiac Cycle • What is meant by atrialsystole? • What is meant by ventracle diastole?

  4. Cardiac Cycle What do you hear when you listen to a person’s heart beat? • Lubb-dupp • Lubb: A-V valves close • Ventricular systole • Dupp: Pulmonary & aortic valves close • Ventricular diastole

  5. Conduction How does the heart know when to beat? • Specialized cells keep steady heart rate • Sino-Atrial Node • This happens independent of body • http://www.youtube.com/watch?v=NEuSCPifKhA

  6. Conduction How does the heart know when and how to beat? • Signal modified subconsciously in your Medulla Oblongata • Signal is sent to S-A Node

  7. Stop & think • How does it benefit the organism to have the heart beat separated from neural input?

  8. Conduction • Sinoatrial node (S-A node) • Initiates the cardiac cycle • Often called the pacemaker • Causes Atrial Syncytium • Both atria to contract (atrial systole)

  9. Conduction • Junction Fibers • Atrioventricular node (A-V node) • A-V bundle (Bundle of His) • All these slow the signal to allow atria to completely contract

  10. Conduction • Bundle branches • Carry impulse to ventricles on either side • Purkinje Fibers • Spread the impulse throughout the ventricular walls

  11. Conduction • Ventricular Syncytium • Contraction of the ventricular walls (ventricular systole) • http://www.youtube.com/watch?v=bxKBQqe_Bo0

  12. Stop & think • Why is it beneficial to have the A-V Node and Bundle Branches? What function do they serve?

  13. Add these tissues to your heart diagram and label them

  14. Measureing cardiac cycle

  15. http://www.youtube.com/watch?v=v3b-YhZmQu8 • http://www.youtube.com/watch?v=Ga8x1-XdXiQ

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