Practice IB Sports, exercise and health science (SEHS) Topic A.1.2 Maintaining Homeostasis with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for A.1.2 Maintaining Homeostasis and mirrors Paper 1A, 1B, 2 style where relevant.
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Based on the graph, which of the following best explains the observed glucose trends?
During a marathon, what is the main goal of homeostasis?
Shivering in cold weather helps maintain homeostasis by:
During a dehydration study, researchers measured plasma antidiuretic hormone (ADH) concentration, urine osmolality and urine production rate in healthy adults.
Figure shows the relationship between plasma ADH concentration, urine osmolality and urine production rate.
Table: Hydration status of three athletes following a 90-minute training session
| Athlete | Body mass loss (%) | Plasma ADH (% of maximum) | Urine colour (1–8 scale) |
|---|---|---|---|
| A | 0.5 | 25 | 2 |
| B | 1.8 | 62 | 5 |
| C | 3.1 | 91 | 7 |
Using the figure, describe the relationship between plasma ADH concentration and urine production rate.
Using the figure, state how urine osmolality changes as plasma ADH concentration increases.
Using the table, identify the athlete who is most dehydrated.
Explain how ADH helps maintain homeostasis during dehydration.
State one stimulus that increases the release of ADH during exercise.
Using the figure and table, discuss how increasing dehydration influences water balance in the body.
Evaluate why maintaining hydration is important for athletic performance during prolonged exercise.
An endurance athlete completes two weeks of training in a hot climate to acclimatize before a competition. The figure shows the athlete's core temperature during a standard exercise test on day 1 and on day 14.
Figure: Core temperature during a standard exercise test on day 1 and day 14
Using the figure, describe how the athlete's core-temperature response to the test changed after acclimatization.
Explain how heat acclimatization improves the body's ability to thermoregulate.
Outline why high humidity makes thermoregulation more difficult during exercise.
Suggest one strategy, other than acclimatization, that could help the athlete cope with competing in the heat.