NMIH202 Science Content Quiz Revision

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NMIH202 Science Content Quiz Revision
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2013-06-03 07:23:23
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NMIH202 Science Content Quiz Revision
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  1. A patient has a myocardial infarct (MI or heart attack). His heart rate drops to 50 bpm. What is the most likely location of the myocardial damage?
    A) R atrium
    B) R ventricle
    C) L ventricle
    D) L atrium
    A) R atrium is the most likely location of the myocardial damage for a patient whose heart rate drops to 50bpm.
    (this multiple choice question has been scrambled)
  2. Where is the atrioventricular (AV) node found?
    a) Near the aortic valve
    b) In the L ventricular myocardium
    c) adjacent to the L atrium
    d) on the interatrial septum
    The atroventricular node is found on the interatrial septum (d).
  3. What is the normal rate of firing of the SA node in an adult?
    a) 30-40 bpm
    b) 40-60 bpm
    c) 60-100 bpm
    d) 80-120 bpm
    The normal adult heart rate is 60-100 bpm. This determined by the number of electrical impulses from the SA node (c).
  4. Parasympathetic nervous system (PNS) stimulation of the heart involves which nerve?
    a) phrenic
    b) subcostal
    c) vagus
    d) saphenous
    Parasympathetic nervous system stimulation of the heart involves the vagus nerve (c).
  5. Which of the following structures is the intrinsic pacemaker of the heart (cardiac pacemaker)?
    a) Sino-atrial node
    b) atrioventricular node
    c) bundle of His
    d) fibres of purkinje
    The (a) Sino-atrial SA node is the structure that is the intrinsic pacemaker of the heart.
  6. What is the effect of parasympathetic nervous system PNS stimulation of the heart?
    a) increases the heart rate
    b) decreases the heart rate
    c) strengths the force of myocardial contraction
    d) significantly weakens the force of heart muscle contraction
    The parasympathetic nervous system stimulation decreases the heart rate (b).
  7. What is the pH of water?
    A) 7.0
    B) 5.0
    C) 6.0
    D) 8.0
    A) Pure water is pH neutral (neither acid or base).
    (this multiple choice question has been scrambled)
  8. What is the normal pH of gastric juices?
    a) 1.6-1.8
    b) 5.5-7.0
    c) 7.35-7.45
    d) 7.8-8.6
    • a) Gastric juices have a pH of 1.6-1.8. 
    • NOTE- 7.35-7.45 is the common pH range of arterial blood.
  9. Which organ is an important component of the body's buffering system used to control blood pH?
    A) Heart
    B) Thyroid Gland
    C) Pancreas
    D) Kidneys
    Kidneys (d) is the organ which is an important component of the body's buffering system used to control blood pH?
  10. A patients ABG is pH 7.49, pO2 99mm Hg, pCO2 22mm Hg. What acid base imbalance is she experiencing?
    a)

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