Paramedic-cardiology 1

33 Questions | Total Attempts: 3767

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Paramedic-cardiology 1

Based off Nancy Caroline's Emergency Care in the streets Chapter 27.


Questions and Answers
  • 1. 
    The layers of the heart, beginning with the outermost layer, are the
    • A. 

      Epicardium,myocardium,and endocardium

    • B. 

      Endocardium,epicardium, and myocardium

    • C. 

      Myocardium,epicardium, andendocardium

    • D. 

      Epicardium,ednocardium, and myocardium

  • 2. 
    What prevents the backflow of blood during ventricular contraction
    • A. 

      The aortic valve

    • B. 

      Semilunar valve

    • C. 

      The pulmonic valve

    • D. 

      Atrioventricular valve

  • 3. 
    Approximately 80% of ventricular filling occurs
    • A. 

      During systole

    • B. 

      During diastole

    • C. 

      When the semilunar valves are open

    • D. 

      When the atrioventricular valves close

  • 4. 
    Atrial kick is most accurately defined as
    • A. 

      The blood that flows passively into the ventricles

    • B. 

      Pressure on the atrioventricular valves during ventricular contraction

    • C. 

      An attempt of the atria to contract against closed valves

    • D. 

      20% of ventricular filling caused by atrial contraction

  • 5. 
    Which of the following statements regarding the right side of the heart is most correct
    • A. 

      It receives blood exclusively from the venae cavae

    • B. 

      The right side of the heart is a low pressure pump

    • C. 

      It pumps against the high resistance of the pulmonary circulation

    • D. 

      The right side of the heart pumps blood through the pulmonary veins

  • 6. 
    In contrast to the right side of the heart, the left side of the heart
    • A. 

      Drives blood out of the heart against the relatively high resistance of the systemic circulation

    • B. 

      Is a high-pressure pump that sends blood through the pulmonary circulation and to the lungs

    • C. 

      Is a relatively low pressure pump that must stretcher its walls in order to force blood through the aorta

    • D. 

      Drives blood out of the heart against the relatively low resistance of the pulmonary circulation

  • 7. 
    Which layer of the blood vessel is made up of elastic fibers and muscle, and provides for strength and contractility
    • A. 

      Tunica media

    • B. 

      Tunica intima

    • C. 

      Tunica adventitia

    • D. 

      Arterial lumen

  • 8. 
    • A. 

      Do not contain valves that prevent backflow of blood

    • B. 

      Have less capacity to increase the size of their diameter

    • C. 

      Are more likely to distend when exposed to back pressure

    • D. 

      Operate on the high-pressure side of the circulatory system

  • 9. 
    The amount of blood that is pumped out by either ventricle per minute is called
    • A. 

      Ejection fraction

    • B. 

      Cardiac output

    • C. 

      Stroke volume

    • D. 

      Minute volume

  • 10. 
    With regard to stroke volume, a healthy heart
    • A. 

      Has a relatively fixed stroke volume

    • B. 

      Has an average stroke volume of 40 ml

    • C. 

      Can double stroke volume if demand is high

    • D. 

      Can easily increase stroke volume by 50%

  • 11. 
    Cardiac output in influenced by
    • A. 

      Heart rate

    • B. 

      Stroke volume

    • C. 

      Heart rate and or stroke volume

    • D. 

      Ejection fraction and heart rate

  • 12. 
    The ability of the heart to vary the degree (force) of its contraction without stretching is called
    • A. 

      Contractility

    • B. 

      Chonotropy

    • C. 

      Automaticity

    • D. 

      Frank-starling effect

  • 13. 
    Administering a drug that possesses a positive chronotropic effect will have a direct effect on
    • A. 

      Stroke volume

    • B. 

      Blood pressure

    • C. 

      Cardiac output

    • D. 

      The heart rate

  • 14. 
    Changes in cardiac contractility may be induced by medications that have a positive or negative__________effect
    • A. 

      Vasoactive

    • B. 

      Dromotropic

    • C. 

      Inotropic

    • D. 

      Chronotropic

  • 15. 
    • A. 

      Generate an electrical impulse from the same site every time

    • B. 

      Spontaneously conduct an electrical impulse between cardiac cells

    • C. 

      Generate its own electrical impulses without stimulation from nerves

    • D. 

      Increas or decrease its heart rate based on the body's metabolic need

  • 16. 
    Which of the following statements regarding the sinoatrial node is most correct
    • A. 

      The SA node is the dominant cardiac pacemaker in healthy patients

    • B. 

      The SA node is a backup cardiac pacemaker in healthy patients

    • C. 

      The SA node is located in the superior aspect of the right ventricle

    • D. 

      Impulses generated by the SA node travel through the right atrium only

  • 17. 
    The atrioventricular junction
    • A. 

      Includes the AV node but not the bundle of His

    • B. 

      Is the dominant and fastest pacemaker of the heart

    • C. 

      Reveives its blood supply from the circumflex artery

    • D. 

      Is composed of the AV node and the bundle of His

  • 18. 
    An electrical impulse is slightly delayed at the AV node so that the
    • A. 

      Bundle of His can depolarize fully

    • B. 

      Ventricles can contract completely

    • C. 

      Primary cardiac pacemaker can reset

    • D. 

      Atria can empty into the ventricles

  • 19. 
    The effect on the velocity of electrical conduction is referred to as the _________effect
    • A. 

      Inotropic

    • B. 

      Dromotropic

    • C. 

      Chronotropic

    • D. 

      Conductivity

  • 20. 
    Thousands of fibrils that are distributed thoughout the ventricles, which represent the end of the cardiac conduction system, are called the
    • A. 

      Bundle branches

    • B. 

      Internodal pathways

    • C. 

      Pukinje fibers

    • D. 

      Cardiac myocytes

  • 21. 
    The sinoatrial node
    • A. 

      Cannot depolarize faster than 100 times/min

    • B. 

      Will normally outpace any slower conduction tissue

    • C. 

      Functions as the heart's secondary pacemaker

    • D. 

      Has an intrinsic firing rate of 40-60 beats per minute

  • 22. 
    The P wave represents
    • A. 

      SA nodal discharge

    • B. 

      Atrial depolarization

    • C. 

      A depaly at the AV node

    • D. 

      Contraction of the atria

  • 23. 
    • A. 

      Depolarization of the inferior part of the atria

    • B. 

      The period of time when the atria are repolarizing

    • C. 

      Full dispersal of electricity throughout both atria

    • D. 

      A momentary conduction delay at the AV junction

  • 24. 
    Which of the following ECG waveforms represents ventricular depolarization
    • A. 

      T waves

    • B. 

      ST segment

    • C. 

      QRS complex

    • D. 

      U wave

  • 25. 
    Stimulation of the parasympathetic nervous system causes all of the following effects, except
    • A. 

      Negative inotropy

    • B. 

      Increased salsivation

    • C. 

      Dilation of the pupils

    • D. 

      Negative chronotropy