Practice D3.3 Homeostasis with authentic IB Biology exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like cell biology, genetics, and ecology. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
In an experiment, subjects are injected with glucagon. Which physiological effect would be most directly observed?
The table below shows fluctuations in blood glucose levels and hormone concentrations after a carbohydrate-rich meal:
| Time (minutes) | Blood Glucose (mg/dL) | Insulin (mU/L) | Glucagon (pg/mL) |
|---|---|---|---|
| 0 | 90 | 5 | 60 |
| 30 | 150 | 45 | 35 |
| 60 | 130 | 40 | 40 |
| 90 | 110 | 25 | 50 |
| 120 | 90 | 10 | 60 |
Which of the following best explains the trends in insulin and glucagon levels after 30 minutes?
Which of the following describes a feedback loop failure in thermoregulation?
Which hormone contributes to long-term body temperature regulation by increasing the metabolic rate?
A patient has high blood glucose despite normal insulin levels. Which is the most likely explanation?
Which of the following molecules would not be filtered during this process of urine formation?
Which of the following occurs when body temperature rises?
Which of the following correctly links a thermoregulatory effector with its mechanism of action?
| Effector | Action |
|---|---|
| Brown fat | Heat production via uncoupled respiration |
| Skeletal muscles | Shivering to increase metabolic heat |
| Skin arterioles | Vasoconstriction to reduce heat loss |
What part of the brain plays a central role in thermoregulation?
A child exposed to extreme cold begins to shiver and exhibits peripheral vasoconstriction, but their core body temperature continues to fall. What does this suggest about their homeostatic system?