Lecture: chp 19

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Lecture: chp 19
2014-11-15 22:04:00
heart bio120
Exam 4
Lecture notes only
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  1. Which heart pump receives rich oxygenated blood and poor oxygenated blood?
    • Pump 1: poor blood
    • Pump 2: rich blood
  2. What CT surrounds the heart?
    a dense CT sac called: Fibrous Pericardium
  3. This CT is inside the heart and also lines blood vessels.
    • Endocardium¬†
  4. This is a thick wall of the heart that does the work; cardiac muscle cells arranged in bundles that spirals around the heart.
  5. This visceral CT covers the surface of the heart
    • Epicardium
  6. T or F: the heart muscle is fast oxidative muscle fiber
    false: slow oxidative muscle fiber
  7. What are the 2 types of cardiac myocytes?
    • contractyle cells
    • autorythic/conducting cells
  8. This myocyte is 99 of the heart and it contracts and pumps the blood.
    contractyle cells
  9. This myocyte is 1% of the heart. it can generate a rythm of the heart.
    autorythmic/conducting cells
  10. What are the 2 groups of the autorythmic/conducting cells?
    • Pacemaker cells
    • conduction fibers
  11. These cells are found in areas called the sinoatrial node (SA NODE) or atrioventricular node (AV NODE)
    Pacemaker cells
  12. These specialized conducting cells: fewer myofilaments and large diameter
    conduction fibers
  13. Describe the parasympathetic conduction pathway
    • 1. SA NODE generates an impulse
    • 2. Impulse travels along cardiac myocytes in atria - atria contracts
    • 3. Impulse is delayed for a fraction of a second at AV node
    • 4. Impulse travels down the atrioventricular bundle (bundle of his) inside the interventricular septum
    • 5. It then splits into left and right bundle branches
    • 6. Purkinje fibers @ apex of heart and travels superiorly into the ventricle walls
  14. What are the 3 functions of the cardiac skeleton? (3 parts)
    • 1. Provides structural support for the heart
    • 2. It anchorcs the myocytes by giving them something to pull against
    • 3. it serves as electrical insulation between atria and ventricles
  15. What is systole and diastole?
    • Systole: heart contraction
    • diastole: heart relaxes
  16. What is the intrinsic HR?
    100bpm - it is the range for the SA node
  17. How is the heart slowed down?
    The parasympathetic NS (X - vagus nerve) slows it down to the resting HR (70-80bpm)
  18. Open or closed?
  19. Closed
  20. Open
  21. If normal BP of a person is greater than 120/80, it can lead to this ______ (growing of the heart)