Card Set Information

2014-12-15 08:44:54
BIO 377 CARLA 20 Exam4 Final
science,medical physiology
CARLA set #20 for BIO 377 at UMaine (Fall 2014). This set pertains to Exam 4 (part of the final).
Show Answers:

  1. Which of the following will NOT occur in response to an increase in sympathetic nervous activity?

    A) increased heart rate
    B) increased venomotor tone
    C) increased insulin release
    D) increased mean arterial pressure
    E) increased glucagon release
    C) increased insulin release
    (this multiple choice question has been scrambled)
  2. If a person starts exercising at a low intensity, a greater proportion of his or her energy will be generated from __________.
  3. As the intensity of exercise increases, the relative contribution of _________ as an energy substrate is increased.
  4. Which of the following statements about respiratory control during exercise is true?

    A) Feedforward systems from central command increase ventilation.
    B) both Feedforward systems from central command increase ventilation and As exercise intensity increases, the increase in ventilation becomes more dependent on increases in respiration rate.
    C) Feedback systems from chemoreceptors prevents an exercise-induced hyperventilation.
    D) all of these
    E) As exercise intensity increases, the increase in ventilation becomes more dependent on increases in respiration rate.
    D) all of these
    (this multiple choice question has been scrambled)
  5. The reduction in vasoconstriction within the vasculature of the skin during exercise in a hot environment is partly mediated by ________.
    a decreased sensitivity of venous adrenergic receptors
  6. What is true of energy mobilization during exercise?
    • Increases in glucagon secretion mobilize energy stores.
    • The liver releases glucose produced from glycogenolysis and gluconeogenesis into the bloodstream.
    • Adipose tissue releases fatty acids into the blood stream.
  7. Which of the following hormones is reduced during exercise?

    A) ADH
    B) glucagon
    C) epinephrine
    D) insulin
    E) cortisol
    D) insulin
    (this multiple choice question has been scrambled)
  8. The elevated plasma testosterone concentration in males leads to a _________ as compared with females.
    greater rate of glycogenolysis
  9. Elevated estrogen levels in females cause a higher rate of _________ during exercise.
    lipid oxidation
  10. The increase in plasma glucagon during exercise is caused by a(n) ____________.
    increase in sympathetic nervous activity
  11. During exercise, the baroreceptor reflex provides negative feedback control of heart rate _________?

    HINT: When?
    when blood pressure has decreased due to fluid loss
  12. Airway resistance is much higher at rest than during exercise, primarily due to an increased __________.
    sympathetically-mediated bronchodilation during exercise
  13. Even though gastrointestinal motility would be slowed during exercise by __________, the __________ during running would speed the movement of the contents.
    increased sympathetic nervous activity; jarring movement
  14. Which of the following would NOT stimulate the movement of digested food through the gastrointestinal tract?

    A) decreased sympathetic nervous activity
    B) hypo-osmotic beverage
    C) jarring motion of running
    D) stress
    E) caffeine
    B) hypo-osmotic beverage
    (this multiple choice question has been scrambled)
  15. During exercise in hot conditions, blood flow must be redistributed away from the ___________ to provide enough blood for active muscle.
    gastrointestinal tract
  16. Blood flow to what two organs is maintained at the expense of possible ischemia to other organs?
    heart & brain
  17. Changes in renal and splanchnic vascular resistance are proportional to ___________.
    core body temperature
  18. Sweat is a _________ solution whose loss would alter blood osmolarity in a direction that would _________ the production of ADH.
    hypo-osmotic; stimulate
  19. The fatigue associated with marathon running has been correlated with a _________.
    depletion of glycogen
  20. Name sources of the fatigue associated with elevated hydrogen ion concentration.
    • inhibition of phosphofructokinase
    • displacement of calcium ions from the troponin molecule
    • interference with hormone-sensitive lipase
  21. Name sources of muscle fatigue.
    • phosphate-induced inhibition of phosphofructokinase
    • calcium accumulation in the mitochondria
    • potassium accumulation
    • interference with mobilization of free fatty acids
  22. The increase in urinary hydrogen excretion associated with exercise results from ______.
    increased aldosterone
  23. Depletion of glycogen from the slow-twitch fibers that are recruited first during exercise will lead to a(n) ___________ if exercise is to continue.
    recruitment of fast-twitch fibers
  24. Name sources of psychological fatigue.
    • hypoglycemia
    • increase in blood hydrogen ion levels
    • hypotension
  25. The consequence of water and salt loss from sweating during long durations of exercise is ___________.
    shrinkage of cells
  26. Consumption of a large volume of deionized water following exercise can cause ________.
    cells to swell
  27. Water intoxication is associated with a(n) _________.
    • decrease in osmolarity of extracellular fluid
    • swelling of cells
    • headache
    • vomiting
  28. What secretes proteins that serve antioxidative functions after exercise?
  29. Tumor necrosis factor can cause _________.
    • increased vascular permeability
    • decreased cardiac contractility
  30. Activity in the sympathetic nervous system before a bout of exercise helps to increase __________.
    venomotor tone
  31. Ventilation changes during exercise are brought about by ________.
    • negative feedback to prevent hyperventilation
    • positive feedback due to central command
    • positive feedback due to input from mechanoreceptors and chemoreceptors in exercising muscle
  32. The ultimate limitations to aerobic exercise capacity may be due to ________.
    the fixed size of the lungs
  33. The plasma concentration of which of the following increases over the course of prolonged exercise?

    A) epinephrine
    B) insulin
    C) glucose
    D) fatty acids
    A) epinephrine
    (this multiple choice question has been scrambled)
  34. So-called "runner's diarrhea" may be caused or exacerbated by __________.
    ingestion of caffeine
  35. Water is conserved during exercise due to increase in ________ secretion.
    aldosterone, ADH, & renin
  36. The fatigue that occurs during the later stages of intense exercise is due in part to depletion of __________ stores in muscle.
  37. Which of the following increase in muscle cells during prolonged exercise, and may contribute to muscle fatigue?

    A) bicarbonate
    B) sodium
    C) potassium
    D) calcium
    C) potassium
    (this multiple choice question has been scrambled)
  38. When Bob replenished lost fluids with pure water, __________.
    • his plasma became hypo-osmotic
    • water moved into his cells to restore iso-osmotic conditions
    • his cells swelled
  39. Post-exercise fever is caused by the action of _________ on the thermoregulatory centers of the hypothalamus.
  40. The sympathetically-mediated reduction in renal blood flow is counterbalanced by __________.
    increased prostaglandin synthesis in the kidney & autoregulatory mechanisms that regulate blood flow