Exercise Physiology Practice Final

156 Questions  I  By Kingslo
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Exercise Quizzes & Trivia
Practice Final for exercise physiology

  
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  • 1. 
    Arteries in the coronary circulation originate 
    • A. 

      In front of pulmonary semilunar valves

    • B. 

      Behind aortic semilunar valves

    • C. 

      In front of AV valves

    • D. 

      Nove of the above


  • 2. 
    After leaving the myocardium, blood from the coronary circulation enters the coronary sinus
    • A. 

      True

    • B. 

      False


  • 3. 
    The pulmonary circuit
    • A. 

      Pumps deoxygenated blood to the left side of the heart via pulmonary veins

    • B. 

      Pumps oxygenated blood to the right side of the heart via systemic arteries

    • C. 

      Pumps oxygenated blood to the left side of the heart via pulmonary veins

    • D. 

      Pumps deoygenated blood to the right side of the heart via pulmonary arteries


  • 4. 
    The systemic circulation begins at the left side of the heart
    • A. 

      True

    • B. 

      False


  • 5. 
    The myocardium receives blood from the arota
    • A. 

      True

    • B. 

      False


  • 6. 
    Cardiac muscle tissue is also known as endocardium
    • A. 

      True

    • B. 

      False


  • 7. 
    Function of this later of the heart serves as a lubricative outer covering
    • A. 

      Myocardium

    • B. 

      Pericardium

    • C. 

      Endocardium

    • D. 

      Epicardium


  • 8. 
    The myocardium is mainly aerobic
    • A. 

      True

    • B. 

      False


  • 9. 
    The energy for the myocardium is mainly carbohydrates
    • A. 

      True

    • B. 

      False


  • 10. 
    An untrained individual may have 30 percent of cardiac injury from a myocardial infarction
    • A. 

      True

    • B. 

      False


  • 11. 
    The cardiac cycle has 2 phases
    • A. 

      True

    • B. 

      False


  • 12. 
    Ventricular Systole is the first phase of the cardiac cycle
    • A. 

      True

    • B. 

      False


  • 13. 
    Ventricular diastole is when the ventricles are relaxed/relaxing
    • A. 

      True

    • B. 

      False


  • 14. 
    During isovolumetric contraction (check all that apply)
    • A. 

      Ventricular pressure rises

    • B. 

      AV valves open

    • C. 

      Ventricular pressure drops

    • D. 

      AV valves close


  • 15. 
    During isovolumetric relaxation
    • A. 

      Ventricles relax

    • B. 

      Ventricular pressure drops

    • C. 

      Atria refills

    • D. 

      Semilunar valves close

    • E. 

      None of the above


  • 16. 
    The atria contract during ventricular diastole
    • A. 

      True

    • B. 

      False


  • 17. 
    The atria relaxes during ventricular systole
    • A. 

      True

    • B. 

      False


  • 18. 
    The ventricles contract ___ sec after the atria
    • A. 

      .01

    • B. 

      .2

    • C. 

      .03

    • D. 

      .1

    • E. 

      .3


  • 19. 
    Resting systole of the ventricles is longer than diastole
    • A. 

      True

    • B. 

      False


  • 20. 
    Systole during heavy exercise is longer than diastole during heavy exericse
    • A. 

      True

    • B. 

      False


  • 21. 
    The heart at rest beats at ____ bpm
    • A. 

      70

    • B. 

      75

    • C. 

      50

    • D. 

      65


  • 22. 
    During heavy exercise, the heart beats at ___ bpm
    • A. 

      200

    • B. 

      150

    • C. 

      165

    • D. 

      180


  • 23. 
    What is considered normal blood presssure?
    • A. 

      115/75 mmHg

    • B. 

      140/90 mmHg

    • C. 

      120/80 mmHg

    • D. 

      None of the above


  • 24. 
    Systolic pressure provides an indication of peripheral resistance
    • A. 

      True

    • B. 

      False


  • 25. 
    Pulse pressure is the difference between systolic and diastolic pressure
    • A. 

      True

    • B. 

      False


  • 26. 
    Which formula is correct in calculating the Mean Arterial Pressure
    • A. 

      MAP = DBP +.33(DBP + SBP)

    • B. 

      MAP = DBP + .33(SBP - DBP)

    • C. 

      MAP = SBP +.33(DBP - SBP)

    • D. 

      MAP = SBP - .33(DBP + SBP)


  • 27. 
    Blood pressure above ____ is known as high blood pressure
    • A. 

      140/80 mmHg

    • B. 

      135/90 mmHg

    • C. 

      120/80 mmHg

    • D. 

      140/90 mmHg


  • 28. 
    Hypertension can cause(check all that apply)
    • A. 

      Right ventricular hypertrophy

    • B. 

      Kidney damage

    • C. 

      Stroke

    • D. 

      Atherosclerosis


  • 29. 
    Cardiac output and total vascular resistance influence mean arterial pressure
    • A. 

      True

    • B. 

      False


  • 30. 
    An increase in blood pressure results in
    • A. 

      A decrease in sympathetic nervous system activity

    • B. 

      An increase in parasympathetic nervous system activity

    • C. 

      A decrease in parasympathetic nervous system activity

    • D. 

      No change at all


  • 31. 
    Long term regulation by the mean arterial blood pressure is influenced by
    • A. 

      The heart

    • B. 

      The kidneys

    • C. 

      The adrenal glands

    • D. 

      The circulatory system


  • 32. 
    An decrease in blood pressure results in an increase in sympathetic nervous system activity
    • A. 

      True

    • B. 

      False


  • 33. 
    When blood viscosity increases, blood pressure decreases
    • A. 

      True

    • B. 

      False


  • 34. 
    When blood volume increases, blood pressure increases
    • A. 

      True

    • B. 

      False


  • 35. 
    When heart rate increase, blood pressure increases
    • A. 

      True

    • B. 

      False


  • 36. 
    When peripheral resistance decreases, blood pressure increases
    • A. 

      True

    • B. 

      False


  • 37. 
    Contraction of the heart depends on electrical stimulation of the _________
    • A. 

      Epithelium of the heart

    • B. 

      Fibrocardium

    • C. 

      Endothelium

    • D. 

      Myocardium


  • 38. 
    The pacemaker of the heart is known as the _________
    • A. 

      SA node

    • B. 

      AV node

    • C. 

      Bundle fibers

    • D. 

      Purkinje fibers


  • 39. 
    The _________ consists of autorhythmic cells
    • A. 

      AV node

    • B. 

      SA node

    • C. 

      Pukinje fibers

    • D. 

      Bundle branches


  • 40. 
    Autorhythmic cells depolarize spontaneously 
    • A. 

      True

    • B. 

      False


  • 41. 
    Baroreceptors are activated/stimulated when BP is too low
    • A. 

      True

    • B. 

      False


  • 42. 
    The ______ represents atrial depolarization 
    • A. 

      QRS Complex

    • B. 

      P Wave

    • C. 

      T Wave

    • D. 

      ST Segment


  • 43. 
    The ECG may indicate coronary heart disease
    • A. 

      True

    • B. 

      False


  • 44. 
    The QRS complex represents ____________
    • A. 

      Atrial repolarization

    • B. 

      Atrial depolarization

    • C. 

      Ventricular depolarization

    • D. 

      Ventricular repolarization


  • 45. 
    An ST segment depression indicates myocardial infarction 
    • A. 

      True

    • B. 

      False


  • 46. 
    One should stop exercise if their exercise induced ST segment is greater than 1 mm
    • A. 

      True

    • B. 

      False


  • 47. 
    A T wave inversion is an indicator of ischemia
    • A. 

      True

    • B. 

      False


  • 48. 
    Atherosclerosis is fatty plaque that narrows the aorta
    • A. 

      True

    • B. 

      False


  • 49. 
    The amount of blood pumped by the heart each minute is known as the _________
    • A. 

      End Volume Systole

    • B. 

      Frank Starling Mechanism

    • C. 

      Stroke volume

    • D. 

      Cardiac output


  • 50. 
    The number of beats per minute is known as the heart rate
    • A. 

      True

    • B. 

      False


  • 51. 
    Amount of blood ejected in each beat is known as the _______
    • A. 

      Stroke volume

    • B. 

      Ejection fraction

    • C. 

      End diastolic volume

    • D. 

      End systolic volume


  • 52. 
    The average cardiac output is 6 L/m
    • A. 

      True

    • B. 

      False


  • 53. 
    The vagus nerve regulates the heart rate via the sympathetic nervous system
    • A. 

      True

    • B. 

      False


  • 54. 
    Beta blocking drugs increase heart rate
    • A. 

      True

    • B. 

      False


  • 55. 
    Beta blocking drugs increase the myocardial oxygen demand
    • A. 

      True

    • B. 

      False


  • 56. 
    An ejection fraction of less than ___ indicates myocardial contraction
    • A. 

      40%

    • B. 

      55%

    • C. 

      60%

    • D. 

      65%


  • 57. 
    During the Frank Starling mechanism, increase preload will stretch the sarcomere from _______
    • A. 

      1.5 - 2.0

    • B. 

      2.0 - 2.4

    • C. 

      1.5 - 2.1

    • D. 

      2.0 - 2.5


  • 58. 
    Venoconstriction is stimulated by the SNS
    • A. 

      True

    • B. 

      False


  • 59. 
    Strength of ventricular contraction is enhanced by acetylcoline
    • A. 

      True

    • B. 

      False


  • 60. 
    The heart cannot be excited if the sympathetic neurons connecting to it are cut off
    • A. 

      True

    • B. 

      False


  • 61. 
    Plasma contains(check all that apply)
    • A. 

      Ions

    • B. 

      Proteins

    • C. 

      Hormones

    • D. 

      Red blood cells


  • 62. 
    Plasma is the portion of  blood that repairs injuries
    • A. 

      True

    • B. 

      False


  • 63. 
    Hematocrit is a % by volume of packed blood cells after centrifugation
    • A. 

      True

    • B. 

      False


  • 64. 
    Resistance depends on 
    • A. 

      Length of the vessel

    • B. 

      Radius of the vessel

    • C. 

      Viscosity of the blood

    • D. 

      None of the above


  • 65. 
    Blood flow is inversely proportional to resistance
    • A. 

      True

    • B. 

      False


  • 66. 
    Which vessels create the most resistance
    • A. 

      Venules

    • B. 

      Large veins

    • C. 

      Arterioles

    • D. 

      Capillaries


  • 67. 
    Oxygen demand by muscles during exercise is 10 - 15x greater than at rest.
    • A. 

      True

    • B. 

      False


  • 68. 
    Max heart rate is found by subtracting ones age from 230
    • A. 

      True

    • B. 

      False


  • 69. 
    During exercise, the SV plateaus at approx. 40-60% of VO2 max
    • A. 

      True

    • B. 

      False


  • 70. 
    Sedentary individuals typically have a resting SV of 
    • A. 

      50 - 60 ml

    • B. 

      40 - 50 ml

    • C. 

      40 - 60 ml

    • D. 

      60 - 70 ml


  • 71. 
    Endurance athletes typically have a stroke volume of 160 - 200 ml during exercise
    • A. 

      True

    • B. 

      False


  • 72. 
    Increased HR is due to an increase in cardiac output 
    • A. 

      True

    • B. 

      False


  • 73. 
    At rest, what is the filling time of the heart?
    • A. 

      400 - 550 ms

    • B. 

      500 - 600 ms

    • C. 

      600 - 800 ms

    • D. 

      500 - 700 ms


  • 74. 
    At 150 - 200 beats per min, approx how long does it take to fill the heart
    • A. 

      ~250 ms

    • B. 

      ~100 ms

    • C. 

      ~150 ms

    • D. 

      ~200 ms


  • 75. 
    VO2 = Cardio Output x VO2 difference; which equation is this?
    • A. 

      Fick Equation

    • B. 

      Blow Resistance Equatio

    • C. 

      Blood Flow Equation

    • D. 

      Rick Equation

    • E. 

      None of the above


  • 76. 
    At rest, ____ of blood is distributed to to muscles
    • A. 

      20 - 25%

    • B. 

      15 - 20%

    • C. 

      10 - 15%

    • D. 

      30 - 40%


  • 77. 
    During maximal exercise, 80 - 85% of blood is distributed to working muscles
    • A. 

      True

    • B. 

      False


  • 78. 
    Vasoconstriction to visceral organs and inactive tissues are due to the SNS
    • A. 

      True

    • B. 

      False


  • 79. 
    Nitric Oxide is produced in the mesothelium 
    • A. 

      True

    • B. 

      False


  • 80. 
    _______ promotes smooth muscle relaxation
    • A. 

      Epinephrine

    • B. 

      Sympathetic nerves

    • C. 

      Nitric oxide

    • D. 

      None of the above


  • 81. 
    At the onset of exercise, parasympathetic nerves fire thus increasing the HR 
    • A. 

      True

    • B. 

      False


  • 82. 
    As the VO2 max increase the double product decreases
    • A. 

      True

    • B. 

      False


  • 83. 
    A rough index of workload on the heart is also known as
    • A. 

      Afterload

    • B. 

      Total peripheral resistance

    • C. 

      Double product

    • D. 

      Blood pressure


  • 84. 
    During incremental exercise (check all that apply)
    • A. 

      Diastolic pressure increases

    • B. 

      Diastolic pressure remains fairly constant

    • C. 

      Systolic pressure increases

    • D. 

      Systolic pressure drops


  • 85. 
    During prolonged exercise, cardiac output is decreases
    • A. 

      True

    • B. 

      False


  • 86. 
    During prolonged exercise, the cardiac output is maintained due to a decrease in stroke volume and an increase in HR.
    • A. 

      True

    • B. 

      False


  • 87. 
    Receptors that are sensitive to force and speed of muscular movement
    • A. 

      Baroreceptors

    • B. 

      Muscle mechanoreceptors

    • C. 

      Heart mechanoreceptors

    • D. 

      Muscle chemoreceptors


  • 88. 
    Receptors that are sensitive to muscle metabolites
    • A. 

      Barorecptors

    • B. 

      Heart mechanoreceptors

    • C. 

      Muscle mechanoreceptors

    • D. 

      Muscle chemoreceptors


  • 89. 
    Receptors that are sensitive to change in arterial blood pressure.
    • A. 

      Heart chemoreceptors

    • B. 

      Muscle mechanorecptors

    • C. 

      Baroreceptors

    • D. 

      Muscle chemoreceptors


  • 90. 
    Random movement of molecules from an area of high concentration to an are of lower concentration is known as osmosis
    • A. 

      True

    • B. 

      False


  • 91. 
    The __________ lines the thoracic wall
    • A. 

      Endothelium

    • B. 

      Visceral pleura

    • C. 

      Parietal pleura

    • D. 

      None of the above


  • 92. 
    The intrapleural pressure is lower than atmospheric pressure
    • A. 

      True

    • B. 

      False


  • 93. 
    Which zone warms and humidifies the air?
    • A. 

      Conducting zone

    • B. 

      Respiratory zone

    • C. 

      Terminal zone


  • 94. 
    What is atmospheric pressure at rest?
    • A. 

      750 mmHg

    • B. 

      740 mmHg

    • C. 

      760 mmHg

    • D. 

      780 mmHg


  • 95. 
    At rest, expiration is passive
    • A. 

      True

    • B. 

      False


  • 96. 
    Current eveidence suggests that respiratory muscles fatigue at prolonged exercise lasting more than
    • A. 

      90 minutes

    • B. 

      100 minutes

    • C. 

      120 minutes

    • D. 

      60 minutes


  • 97. 
    Which is the current formula for Air Flow?
    • A. 

      Airflow = (P2 - P1)/resistance

    • B. 

      Airflow = (P1 + P2)/resistance

    • C. 

      Airflow = (P1 - P2)/resistance

    • D. 

      None of the above


  • 98. 
    Shortness of breathing is termed
    • A. 

      Asthma

    • B. 

      Bronchospasm

    • C. 

      Dyspnea

    • D. 

      COPD


  • 99. 
    Excessive mucus blocked in the airways
    • A. 

      Exercise induced asthma

    • B. 

      Asthma

    • C. 

      Emphysema

    • D. 

      Chronic bronchitis


  • 100. 
    Airway collapse; air is trapped in the lungs
    • A. 

      Asthma

    • B. 

      COPD

    • C. 

      Emphysema

    • D. 

      Chronic bronchitis


  • 101. 
    Chronic obstructive lung disease is linked with an increased expiratory airflow and an decreased inspiratory airflow due to constant airway narrowing
    • A. 

      True

    • B. 

      False


  • 102. 
    Amount of air moved per breath (normal breathing)
    • A. 

      Dead space ventilation

    • B. 

      Breathing frequency

    • C. 

      Alveolar ventilation

    • D. 

      None of the above


  • 103. 
    Volume of air space that reaches the respiratory zone
    • A. 

      Vital capacity

    • B. 

      Dead space ventilation

    • C. 

      Alveolar ventilation

    • D. 

      Total lung capacity


  • 104. 
    The tidal volume x the alveolar ventilation will give you the amount of air moved in and out of the lungs per minute
    • A. 

      True

    • B. 

      False


  • 105. 
    The amount of air moved in and out of the lungs per min
    • A. 

      Systemic ventilation

    • B. 

      Dead space ventilation

    • C. 

      Pulmonary ventilation

    • D. 

      Tidal volume


  • 106. 
    The alveolar ventilation + dead space ventilation = pulmonary ventilation
    • A. 

      True

    • B. 

      False


  • 107. 
    The vital capacity is 
    • A. 

      The amount of gas in the lungs after a maximum inspiration

    • B. 

      Volume of gas remaining in lings after maximum expiration

    • C. 

      Maximum amount of gas that can be expired after a maximum inspiration

    • D. 

      None of the above


  • 108. 
    The typical value for the tidal volume is 
    • A. 

      300 mL

    • B. 

      600 mL

    • C. 

      500 mL

    • D. 

      350 mL


  • 109. 
    The typical lung capacity is at
    • A. 

      7500 mL

    • B. 

      7000 mL

    • C. 

      6000 mL

    • D. 

      5000 mL


  • 110. 
    When standing, most of the blood goes to the apex of the lung
    • A. 

      True

    • B. 

      False


  • 111. 
    The systemic circulation has lower pressure than the pulmonary circulation 
    • A. 

      True

    • B. 

      False


  • 112. 
    Deoxyhemoglobin is simply hemoglobin carrying carbon dioxide 
    • A. 

      True

    • B. 

      False


  • 113. 
    The O2 content of blood (100% Hb saturation) for males is typically
    • A. 

      300 ml O2/L blood

    • B. 

      200 ml O2/L blood

    • C. 

      150 ml O2/L blood

    • D. 

      250 ml O2/L blood


  • 114. 
    The O2 content of blood (100% Hb saturation) for females is typically
    • A. 

      174 ml O2/L blood

    • B. 

      155 ml O2/L blood

    • C. 

      168 ml O2/L blood

    • D. 

      185 ml O2/L blood


  • 115. 
    Each gram of Hb can transport ____
    • A. 

      1.6 ml O2

    • B. 

      2 ml O2

    • C. 

      1.5 ml O2

    • D. 

      1.34 ml O2


  • 116. 
    Low partial pressure in the tissues increases the the chance of O2 release to tissues by Hb
    • A. 

      True

    • B. 

      False


  • 117. 
    Decreased pH increases the Hb-O2 affinity thus resulting in a rightward shift of the curve
    • A. 

      True

    • B. 

      False


  • 118. 
    Which of the following causes a rightward shift of the dissociation curve(check all that apply)
    • A. 

      Decreased pH

    • B. 

      Increased temperature

    • C. 

      Increased pH

    • D. 

      All of the above cause a rightward shift


  • 119. 
    Hemoglobin has a higher affinity for O2 than myoglobin
    • A. 

      True

    • B. 

      False


  • 120. 
    Carbonic anhydrase converts CO2 and water into Bicarbonate
    • A. 

      True

    • B. 

      False


  • 121. 
    How much % of CO2 is dissolved in the plasma
    • A. 

      15%

    • B. 

      10%

    • C. 

      20%

    • D. 

      25%


  • 122. 
    When HCO3- diffuses out of the RBC's into plasma
    • A. 

      Argon diffuses into the RBC's

    • B. 

      Chloride diffuses into the RBC's

    • C. 

      Hydrogen ions diffuse into the RBC's

    • D. 

      Nothing happens


  • 123. 
    Hydrogen binds to Hb to prevent acidity
    • A. 

      True

    • B. 

      False


  • 124. 
    Carbon dioxide that is bound to hemoglobin is called carbaminohemoglobin
    • A. 

      True

    • B. 

      False


  • 125. 
    HCO3- is a strong acid
    • A. 

      True

    • B. 

      False


  • 126. 
    Over __ of the O2 transported in blood is chemically bonded with hemoglobin
    • A. 

      95%

    • B. 

      90%

    • C. 

      85%

    • D. 

      99%


  • 127. 
    Carbon dioxide is transported in ONLY 3 blood forms
    • A. 

      True

    • B. 

      False


  • 128. 
    __ of CO2 is found in the blood is transported as bicarbonate
    • A. 

      65%

    • B. 

      75%

    • C. 

      80%

    • D. 

      70%


  • 129. 
    An increase in pulmonary ventilation causes exhalation of additional CO2, which results in a reduction of blood PCO2 and a lowering of hydrogen ion concentration
    • A. 

      True

    • B. 

      False


  • 130. 
    During prolonged submaximal exercise in a hot/humid environment, ventilation tends to shift downward
    • A. 

      True

    • B. 

      False


  • 131. 
    In an untrained subject doing incremental exercise, ventilation increases linearly up to 
    • A. 

      ~50 - 75% VO2 max

    • B. 

      ~65 - 85% VO2 max

    • C. 

      ~50 - 60 % VO2 max

    • D. 

      None of the above


  • 132. 
    The inflection point where VE increases exponentially is known as the respiratory threshold 
    • A. 

      True

    • B. 

      False


  • 133. 
    Arterial PO2 and PCO2 are maintained relatively constant during a sub maximal exercise
    • A. 

      True

    • B. 

      False


  • 134. 
    During prolonged exercise in a hot/humid environment, ventilation "drifts" upward due to the influence of rising body temperature on the respiratory control center
    • A. 

      True

    • B. 

      False


  • 135. 
    Which part of the brain is is the respiratory control center?
    • A. 

      Cerebellum

    • B. 

      Frontal lobe

    • C. 

      Brain stem

    • D. 

      Cerebrum


  • 136. 
    When the diaphragm contracts, the lungs __________
    • A. 

      Expire

    • B. 

      Inspire

    • C. 

      The abdominals control breathing, not diaphrams

    • D. 

      None of the above


  • 137. 
    Central chemoreceptors are located in the___________
    • A. 

      Medulla

    • B. 

      Association area

    • C. 

      Thalamus

    • D. 

      Hypothalamus


  • 138. 
    The diaphragm is innervated by somatic motor neurons
    • A. 

      True

    • B. 

      False


  • 139. 
    Specialized cells located in the aortic and carotid bodies
    • A. 

      Central chemoreceptors

    • B. 

      Peripheral chemoreceptors

    • C. 

      Baroreceptors

    • D. 

      None of the above


  • 140. 
    There are 2 types or Humoral receptors
    • A. 

      True

    • B. 

      False


  • 141. 
    Ventilation control during exercise is fine tuned by ____________
    • A. 

      Humoral chemoreceptors

    • B. 

      Higher brain centers

    • C. 

      Neural feedback from muscle

    • D. 

      All of the above


  • 142. 
    During heavy or submaximal exercise, a linear rise in ventilation is due to _________(check all that apply)
    • A. 

      Increasing blood H+

    • B. 

      Parasympathetic firing

    • C. 

      Body temperature

    • D. 

      Blood catecholamines

    • E. 

      K+


  • 143. 
    The primary drive to increase ventilation during exercise in from higher brain centers
    • A. 

      True

    • B. 

      False


  • 144. 
    Training can eventually change the structure of the lungs so it could take up more oxygen.
    • A. 

      True

    • B. 

      False


  • 145. 
    Training can lower exercise ventilation 20 - 30% lower at the same submaximal work rate
    • A. 

      True

    • B. 

      False


  • 146. 
    Current evidence suggests that the normal rhythm of breathing is generated by the interaction between _____ separate respirator rhythm centers located in the medulla oblongata and the pons.
    • A. 

      Five

    • B. 

      Four

    • C. 

      Three

    • D. 

      Two


  • 147. 
    At rest, the breathing rhythm is dominated by pacemaker neurons in the 
    • A. 

      Pneumoraxic center

    • B. 

      Retrotrapezodial nucleus

    • C. 

      Caudal pons

    • D. 

      PreBotzinger Complex


  • 148. 
    During exercise, the preBotzinger Complex interacts with _________ along with two additional regulatory centers in the pons to regulate breathing
    • A. 

      The vagus nerve

    • B. 

      Sympathetic neurons

    • C. 

      Medulla oblongata

    • D. 

      The retrotrapezodial nucleus


  • 149. 
    The respiratory control center uses only negative feedback to achieve tight control
    • A. 

      True

    • B. 

      False


  • 150. 
    The central chemoreceptors are sensitive to increases in ______ and decreases in pH
    • A. 

      H+

    • B. 

      K+

    • C. 

      PCO2

    • D. 

      PO2


  • 151. 
    The peripheral chemoreceptors are sensitive to increases in PCO2 and decreases in PO2 or pH
    • A. 

      True

    • B. 

      False


  • 152. 
    Receptors that are sensitive to an increase in PCO2 exist.
    • A. 

      True

    • B. 

      False

    • C. 

      They are hypothesized to exist


  • 153. 
    In regards to peripheral chemoreceptors 
    • A. 

      Carotid bodies are more important that aortic bodies

    • B. 

      Aortic bodies are more important than carotid bodies

    • C. 

      They are equally important


  • 154. 
    There is new evidence that respiratory muscle fatigue does occur during high intensity exercise (>90% VO2 max)
    • A. 

      True

    • B. 

      False


  • 155. 
    _________ of elite endurance athletes experience hypoxemia during high intensity exercise (>90% VO2 max)
    • A. 

      20 - 30%

    • B. 

      40 - 50%

    • C. 

      45 - 55%

    • D. 

      30 - 40%


  • 156. 
    The pulmonary system limits exercise performance in healthy young subjects during prolonged submaximal exercise (work rates (<90% VO2 max)
    • A. 

      True

    • B. 

      False


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