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Lectures 3-6 Cardiac Physiology

Daniel Mosele 34 preguntas

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Preguntas del test (34)

  1. 1Which of the following statements are TRUE regarding cardiac myocytes?
    1. Athe vast majority of intracellular proteins are fixed and carry a positive charge
    2. BThe equilibrium membrane potential for Na+ is higher than the potential for K+
    3. CAction potentials are initiated by the opening of voltage gated Calcium channels
    4. DThe delayed opening of voltage gated sodium channels are responsible for maintaining the plateau of the action potential
    5. EThis graph is an accurate representation of the predicted membrane potential over time.Imagen de la opción E
  2. 2The Na+/K+ ATPase helps maintain the resting membrane potential of roughly -85mV in cardiac myocytes.

    For each unit of ATP expended [blank_start]3[blank_end] [blank_start]Na+[blank_end] Ions are pumped out and [blank_start]2[blank_end] [blank_start]K+[blank_end] ions pumped in
    1. A3
    2. B2
    3. C1
    4. DNa+
    5. EK+
    6. F2
    7. G1
    8. H3
    9. IK+
    10. JNa+
  3. 3During Diastole which of the following movement of ions are occurring in cardiac myocytes.
    1. AThere is a Net Passive movement of Na+ ions into the cell
    2. BThere is a Net Passive movement of Na+ ions out of the cell
    3. CThere is a Net Passive movement of K+ ions into the cell
    4. DThere is a Net Passive movement of K+ ions out of the cell
    5. EThere is a Net Passive movement of Ca2+ ions into the cell
    6. FThere is a Net Passive movement of Ca2+ ions out of the cell
    7. GNa+ is being actively pumped into the cell in exchange for K+ which is being pumped out
    8. HNa+ is being actively pumped into the cell in exchange for Ca2+ which is being pumped out
    9. IK+ is being actively pumped into the cell in exchange for Na+ which is being pumped out
    10. JCa2+ is being actively pumped into the cell in exchange for Na+ which is being pumped out
  4. 4Which of the following statements are correct?Imagen de la pregunta 4
    1. AAt Point 1 there is a large movement of Na+ ions into the Cell
    2. BAt Point 1 Voltage Gated Sodium channels are Open
    3. CAt Point 1 Voltage Gated Potassium channels are Open
    4. DAt Point 2 Voltage Gated Potassium channels are Open
    5. EAt Point 2 Voltage Gated Sodium channels are Open
    6. FAt Point 2 the dip in membrane potential is due to efflux of Ca2+ through voltage gated channels
    7. GPoint 3 represents the plateau, which is maintained by Calcium efflux
    8. HPoint 3 represents the plateau, which is maintained by Calcium influx
    9. IDuring Stage 4 passive movement of K+ though only leak channels returns the membrane potential to rest
    10. JDuring Stage 4 the net movement of chloride is from the ICF to the ECF
  5. 5Which of the following statements is FALSE regarding the refractory period of a cardiac myocyte Action Potential?Imagen de la pregunta 5
    1. AThe Absolute refractory period is due to the rapid inactivation of Na+ channels after they open, these channels are not reactivated until membrane potential is below 65mV
    2. BDue to the extended refractory period, cardiac muscle can not be tetanized
    3. CAnother Action Potential can not be initiated during any of the stages 1-4
    4. DThe inactivation of VO Na+ channels causes a change in the shape of the protein channel, blocking the passage of Na+ ions.
    5. EAll of the above are true
  6. 6Fast response action potentials occur in the SA Node
    1. AVerdadero
    2. BFalso
  7. 7Order the following from those most permeable to sodium and calcium, to those least permeable to sodium and calcium.

    1. [blank_start]SA Node[blank_end]
    2. [blank_start]AV Node[blank_end]
    3. [blank_start]Bundle of His[blank_end]
    4. [blank_start]Purkinje Fibres[blank_end]

    Options:
    Bundle of His
    SA Node
    Purkinje Fibres
    AV Node
    1. ASA Node
    2. BAV Node
    3. CBundle of His
    4. DPurkinje Fibres
  8. 8Which of the following are true of pacemaker cells in the AV Node
    1. AResting Membrane potential is stable
    2. BResting Membrane potential is unstable
    3. CVoltage Gated Sodium Channels are present
    4. DVoltage Gated Calcium Channels are present
    5. EThreshold is higher compared to Cardiac Myocytes
    6. FThreshold is lower compared to Cardiac Myocytes
    7. GAmplitude of the Action Potential is higher compared to Cardiac Myocytes
    8. HAmplitude of the Action Potential is lower compared to Cardiac Myocytes
    9. ISodium Influx into the cell does not occur at any point in time
    10. JThere is a greater permeability to Calcium than the SA Node
  9. 9Parasympathetic/Vagal Innervation of the SA Node will result in
    1. AIncreased Heart Rate
    2. BDecreased Heart Rate
    3. CIncreased Permeability to Calcium
    4. DIncreased Permeability to Sodium
    5. EIncreased Permeability to Potassium
    6. FHyperpolarisation
    7. GDepolarisation
    8. HAcetylcholine is the neurotransmitter
    9. INoradrenaline is the neurotransmitter
    10. JThe neurotransmitter binds to Beta 1 Receptors.
  10. 10Which of the following are TRUE regarding conduction velocity
    1. AIs the same across the heart
    2. BSmaller fibres conduct faster than larger fibres
    3. CLarger fibres conduct faster than smaller fibres

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Descripción
(Anatomy and Physiology Lectures) Veterinary Bioscience 1: Cardiovascular System Test sobre Lectures 3-6 Cardiac Physiology, creado por Daniel Mosele el 28/08/2016.
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