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?
(e) one stimulus that increases the release of ADH during exercise.
(f) Using the figure and table, how increasing dehydration influences water balance in the body.
(g) why maintaining hydration is important for athletic performance during prolonged exercise.
Shivering in cold weather helps maintain homeostasis by:
(a) Using the figure, the relationship between plasma ADH concentration and urine production rate.
(b) Using the figure, how urine osmolality changes as plasma ADH concentration increases.
(c) Using the table, the athlete who is most dehydrated.
(d) how ADH helps maintain homeostasis during dehydration.
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
(a) Using the figure, how the athlete's core-temperature response to the test changed after acclimatization.
(b) how heat acclimatization improves the body's ability to thermoregulate.
(c) why high humidity makes thermoregulation more difficult during exercise.
(d) one strategy, other than acclimatization, that could help the athlete cope with competing in the heat.
High-GI meals reduce insulin release, resulting in higher blood sugar throughout exercise
Low-GI meals maintain stable glucose availability, enhancing endurance performance
Low-GI meals trigger rapid insulin response and lead to early hypoglycemia
High-GI meals increase glucagon secretion and stabilize blood glucose better
To allow rapid, unregulated changes in body temperature and blood pH
To maintain a relatively stable internal environment for performance
To keep variables such as core temperature and blood glucose within narrow limits
To restore internal conditions toward resting levels after exercise-induced change
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 |
