Practice A.2.3 Energy systems with authentic IB Sports, exercise and health science (SEHS) exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like core principles, advanced applications, and practical problem-solving. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Paper
Level
Question 1
SLPaper 2
1.[2]
State two functions of potassium in exercise physiology.
2.[2]
Identify two consequences of excessive water intake without electrolyte replacement.
3.[3]
Describe the process of osmoregulation during prolonged exercise.
4.[4]
Explain how thermoregulation is influenced by hydration status.
5.[4]
Outline two adaptations in trained endurance athletes that improve fluid and electrolyte efficiency.
6.[5]
Discuss the physiological effects of chronic dehydration on athletic performance and recovery.
Question 2
SLPaper 1A
The graph shows VO₂ max (y-axis in mL/kg/min) over 12 weeks of endurance training (x-axis) for three groups. Which group demonstrates the greatest relative improvement in aerobic capacity over the 12-week training period?
Question 3
SLPaper 2
1.[2]
State one function of water in the human body and one way it is lost.
2.[2]
Identify two symptoms of mild dehydration.
3.[3]
Describe how electrolytes contribute to hydration balance.
4.[4]
Explain four ways the body responds to fluid loss during exercise.
5.[4]
Outline how dehydration affects aerobic performance.
6.[5]
Discuss the importance of maintaining fluid and electrolyte balance during prolonged physical activity.
Question 4
SLPaper 2
1.[2]
Identify two causes of fluid loss during exercise
2.[2]
State two effects of hyponatremia.
3.[3]
Describe three functions of water during physical activity.
4.[4]
Explain how fluid replacement strategies can prevent performance decline in endurance events.
5.[4]
Outline the roles of sodium and potassium in regulating hydration status.
6.[5]
Discuss how hydration needs vary depending on environmental conditions and exercise intensity.
Question 5
SL & HLPaper 1A
Why is the lactate inflection point important for endurance athletes?
Question 6
SL & HLPaper 1A
Why is VO₂max considered a good predictor of endurance performance?
Question 7
SL & HLPaper 1A
Why might two athletes of the same age have different VO₂max values?
Question 8
HLPaper 1A
The lactate inflection point is best defined as:
Question 9
SL & HLPaper 1A
Which physiological factor limits VO₂max most in elite athletes?
Question 10
SL & HLPaper 1A
Which of the following occurs during the slow phase of EPOC in recovery?