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WorksheetsExercise Physiology Quiz
Total questions: 10
Worksheet time: 5mins
The primary extracellular buffer system for H+ during exercise is:
Phosphate buffer
Hemoglobin buffer
Bicarbonate buffer
Protein buffer in muscle only
During heavy exercise, the largest immediate source of metabolic acidosis in muscle is best attributed to:
Lactate directly releasing H+
ATP hydrolysis and associated reactions increasing H+ availability
Ketone body production
Urea cycle activation
A progressive rise in core temperature during exercise in the heat is most likely to cause:
Decreased skin blood flow
Increased sweating and cutaneous vasodilation
Increased plasma volume
Reduced heart rate at fixed workload
Cardiovascular drift during prolonged exercise in the heat is characterized by:
Decreasing HR and increasing SV
Increasing HR and decreasing SV at a constant workload
Increasing SV and Q with stable HR
No change in HR or SV
Exercise-associated hyponatremia is most commonly caused by:
Too little sweating
Excessive intake of hypotonic fluid relative to sodium loss
Too much sodium intake
High altitude exposure
During repeated high-intensity contractions, extracellular K+ can rise. The immediate functional consequence most associated with this is:
Improved membrane excitability indefinitely
Reduced action potential propagation and force production
Increased myosin ATPase activity
Increased calcium sensitivity of troponin
The most direct mechanism for maintaining plasma osmolality during dehydration is increased secretion of:
Insulin
Antidiuretic hormone (vasopressin)
Calcitonin
Erythropoietin
Metabolic heat production during exercise is primarily determined by:
Mechanical efficiency and total metabolic rate
Only ambient temperature
Only sweat rate
Only body fat percentage
If ventilation increases disproportionately to VO2 during incremental exercise, this most directly reflects:
A reduced need to eliminate CO2
Increased buffering of H+ producing additional CO2 and stimulating ventilation
A sudden drop in arterial O2 content at low workloads
A decrease in chemoreceptor sensitivity
The primary immediate defense against hypoglycemia during prolonged exercise in healthy individuals is:
Increased insulin secretion
Reduced hepatic glucose output
Increased hepatic glucose production via glucagon and catecholamines
Increased renal glucose excretion
