Ex Phys 2

45 Questions

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Study Quizzes & Trivia

Questions and Answers
  • 1. 
    At rest, energy is supplied primarily by:
    • A. 

      The ATP-PC system

    • B. 

      Anaerobic glycolysis with the food fuels being 2/3 fat and 1/3 glucose

    • C. 

      Both the anaerobic glycolysis and ATP-PC systems

    • D. 

      Aerobic pathways with the food fuel being principally fat

    • E. 

      Aerobic pathways with the food fuel being principally glycogen

  • 2. 
    A factor that contributes to excess post exercise oxygen consumption is
    • A. 

      Decreased body temperature

    • B. 

      Resynthesis of creatine phosphate in muscle

    • C. 

      Glycolysis

    • D. 

      None of the above

  • 3. 
    The sarcoplasmic reticulum plays a very special role in the process of depolarization leading to muscle contraction when it:
    • A. 

      Rapidly releases Ca++

    • B. 

      Insulates the muscle fiber at the myoneural junction

    • C. 

      Adds conective tissue structure to the sarcoplasm

    • D. 

      Inhibits depolarization when it has reached threshold

  • 4. 
    Based on what you know about the saturation of arterial blood with oxygen, administering 100% O2 at sea level is:
    • A. 

      Of little value in enhancing performance no matter when it is given

    • B. 

      Of great value if the athlete could breath it conveniently while competing

    • C. 

      Of value during the latter stages of recovery

    • D. 

      Of value before competition

  • 5. 
    The term oxygen debt is currently:
    • A. 

      Being replaceed by EPOC

    • B. 

      Used instead of EPOC

    • C. 

      The favored term

    • D. 

      Both b & c

  • 6. 
    Expressed as a percentage, the portion of the blood composed primarily of red blood cells is called?
    • A. 

      Hemoglobin

    • B. 

      Hematocrit

    • C. 

      Hemoconcentration

    • D. 

      Vol%

  • 7. 
    If the heart rate is 70 and the cardiac output is 5.0 liters, what is the approximate stroke volume?
    • A. 

      40 ml/beat

    • B. 

      50 ml/beat

    • C. 

      60 ml/beat

    • D. 

      70 ml/beat

  • 8. 
    The mobilization of free fatty acids into the blood is inhibited by:
    • A. 

      Insulin

    • B. 

      Glycogen

    • C. 

      Lactic acid

    • D. 

      Both a & c

  • 9. 
    • A. 

      Soleus muscle

    • B. 

      Red vastus muscle

    • C. 

      Heart

    • D. 

      Gastrocnemius

  • 10. 
    The slow component of recovery following high intensity exercise to fatigue is:
    • A. 

      Unrelated to total recovery oxygen

    • B. 

      The major contributing factor tor recovery oxygen

    • C. 

      Repaid quickly upon the cessation of work

    • D. 

      Not measurable

  • 11. 
    Principle energy stores, in general, that need replenishment following exercise include:
    • A. 

      The phosphagens and glycogen

    • B. 

      The phosphagens and fat

    • C. 

      Fats and glycogen

    • D. 

      Protein and glycogen

  • 12. 
    • A. 

      LDH

    • B. 

      Hormone sensitive lipase

    • C. 

      Membrane bound lipase

    • D. 

      Lipoprotein lipase

  • 13. 
    The oxygen carrying capacity of hemoglobin is:
    • A. 

      12 L min

    • B. 

      1.34 ml g of hemoglobin

    • C. 

      Not known

    • D. 

      None of the above

  • 14. 
    The portion of the myofilament that resides between the z lines is called the:
    • A. 

      I band

    • B. 

      A band

    • C. 

      H zone

    • D. 

      Sarcomere

  • 15. 
    • A. 

      Increased heart rate

    • B. 

      Increased blood flow to the viscera

    • C. 

      Increased circulation of free fatty acids

    • D. 

      A and B

    • E. 

      A and C

  • 16. 
    The enzyme that activates the breakdown of a fourteen carbon fatty acid in beta oxidation is
    • A. 

      SCAD

    • B. 

      MCAD

    • C. 

      LCAD

    • D. 

      VLCAD

  • 17. 
    Generally speaking, as exercise intensity increases, end diastolic volume (preload)
    • A. 

      Increases

    • B. 

      Decreases slightly

    • C. 

      Remains the same

    • D. 

      Decreases drastically

  • 18. 
    An increase in end diastolic volume would influenc which of the following most immediately or directly?
    • A. 

      Blood pressure

    • B. 

      Stroke volume

    • C. 

      Contraction time

    • D. 

      Perfusion

  • 19. 
    The resting membrane potential that exists in nerve and muscle cells is due to the:
    • A. 

      Prescence of myelin

    • B. 

      Prescence of negative ions

    • C. 

      Constant flux of liquids

    • D. 

      Semi-permeable membrane

  • 20. 
    The initial event at the onset of exercise activating phosphorylase activity is
    • A. 

      Increased intracellular cAMP

    • B. 

      Increased intracellular calcium

    • C. 

      Increased release of epinephrine

    • D. 

      None of the above

  • 21. 
    An increased oxygen supply to working muscle during exercise is partially dependent upon:
    • A. 

      An increased heart rate

    • B. 

      Vasoconstriction in the non-working muscle

    • C. 

      Decreased stroke volume

    • D. 

      A and b

  • 22. 
    From the AV node, the wave of myocardial depolarization passes down the
    • A. 

      SA node

    • B. 

      Bundle of HIS

    • C. 

      Pukinje fibers

    • D. 

      Left bundle branch

  • 23. 
    Mean arterial pressure goes from a value of about 95 mmHg as it enters the aorta to about ? mmHg as it enters the right atrium
    • A. 

      25

    • B. 

      90

    • C. 

      0

    • D. 

      50

  • 24. 
    • A. 

      Sympathetic neural stimulation

    • B. 

      Circulating catecholamines

    • C. 

      Increase core temperature

    • D. 

      A and b

    • E. 

      B and c

  • 25. 
    The volume of blood returned to the right atrium may be increased by all of the following except:
    • A. 

      Skeletal muscle pump

    • B. 

      Venoconstriction

    • C. 

      Respiratory muscle pump

    • D. 

      Capillary pump

  • 26. 
    The factor which has the greatest influence on peripheral resistance
    • A. 

      Heart rate

    • B. 

      Vessel diameter

    • C. 

      Blood viscosity

    • D. 

      Vessel length

  • 27. 
    The vagus nerve evokes the following response from the heart
    • A. 

      Arrhythmias

    • B. 

      Tachycardia

    • C. 

      Decreased rate

    • D. 

      Increased rate

  • 28. 
    The major pacemaker of the heart is the?
    • A. 

      Purkinje system

    • B. 

      Bundle of HIs

    • C. 

      Sinoatrial node

    • D. 

      Atriventricular node

  • 29. 
    Resting bradycardia, resulting from exercise training, is due to
    • A. 

      Decreased sympathetic activity

    • B. 

      Increased sympathetic activity

    • C. 

      Decreased parasympathetic activity

    • D. 

      Increased parasympathetic activity

  • 30. 
    The neurotransmitter released at the motor nerve ending is:
    • A. 

      Epinephrine

    • B. 

      Acetylcholine

    • C. 

      Serotonin

    • D. 

      Dopamine

  • 31. 
    • A. 

      Total peripheral resistance

    • B. 

      Elasticity of the arteries

    • C. 

      Stroke volume

    • D. 

      A and b

    • E. 

      B and c

  • 32. 
    • A. 

      Reduced elasticity of the aorta

    • B. 

      Increased peripheral resistance

    • C. 

      Increased stroke volume and/or cardiac output

    • D. 

      None of the above

  • 33. 
    • A. 

      Peripheral resistance remains constant

    • B. 

      Stroke volume rises

    • C. 

      Heart rate increases

    • D. 

      Vasodilation increases

  • 34. 
    The trigger to initiate the contractile process in skeletal muscle is:
    • A. 

      Potassium binding to myosin

    • B. 

      Calcium binding to actin

    • C. 

      Calcium binding to troponin

    • D. 

      ATP binding to the myosin cross bridges

  • 35. 
    • A. 

      Ventricular systole

    • B. 

      Atrial diastole

    • C. 

      Atrial systole

    • D. 

      Ventricular diastole

  • 36. 
    • A. 

      Little potassium would move into the cell

    • B. 

      The action potential would be of small voltage

    • C. 

      Negatively charged protein ions would move out

    • D. 

      Little sodium would move into the cell

  • 37. 
    An example of proprioceptors that provide the CNS with information are
    • A. 

      Muscle spindles

    • B. 

      Golgi tendon organs

    • C. 

      Joint receptors

    • D. 

      All the above

  • 38. 
    The relationship between the force of contraction of the heart and end diastolic volume within normal limits can best be described as:
    • A. 

      Directly related

    • B. 

      Equal

    • C. 

      Inversely related

    • D. 

      Hyperbolic

  • 39. 
    The golgi tendon organs monitor:
    • A. 

      Tension produced by muscular contraction

    • B. 

      The length of the muscle

    • C. 

      The concentration of sodium ions in the sarcoplasm

    • D. 

      The position of joints during movement

  • 40. 
    Fast twich fibers contain:
    • A. 

      Relatively large number of mitochondria and low ATPase activity

    • B. 

      Relatively small number of mitochondria and low ATPase activity

    • C. 

      Relatively small number of mitochondria and high ATPase activity

    • D. 

      None of the above are correct

  • 41. 
    The beginning substrate for the Krebs Cycle are
    • A. 

      Pyruvate-oxaloacetate

    • B. 

      Acetyl-CoA-citrate

    • C. 

      Pyruvate-citrate

    • D. 

      Oxaloacetate-acetyl-CoA

  • 42. 
    Information regarding the amount of stretch placed on a muscle fiber is sent to the CNS via
    • A. 

      Pacinian corpuscles

    • B. 

      Muscle spindles

    • C. 

      Ruffini endings

    • D. 

      Golgi tendon organs

  • 43. 
    Calcium released from the sarcoplasmic reticulum is important because:
    • A. 

      It binds with troponin which charges the cross-bridge complex so actin and myosin can bind

    • B. 

      It binds wiht myosin blocking its coupling with actin

    • C. 

      Both actin and myosin bind to calcium which acts as a cross-bridge

    • D. 

      It is used to create energy for muscle contraction

  • 44. 
    A contraction where a muscle exerts tension while shortening in length is an
    • A. 

      Isometric contraction

    • B. 

      Isotonic contraction

    • C. 

      Isokinetic contraction

    • D. 

      Eccentric contraction

  • 45. 
    The loss of muscle mass in aging humans is often due to
    • A. 

      Increased activity levels

    • B. 

      Hypertrophy due to hormonal changes

    • C. 

      Atrophy due to disuse

    • D. 

      A shift in fiber type