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- Homeostasis involves maintaining steady internal conditions through a system with receptor/sensor, control centre/integration, effector, and stimulus components; examples include temperature regulation via sweating or wearing clothes.
- The brain prioritizes glucose uptake for energy, using active transport with varying affinities in different tissues, ensuring the brain receives sufficient sugar even during low blood levels.
- Temperature ranges for life are from 0°C to 100°C; however, some fish can survive below freezing due to salt content and fluid blood. Humidity affects sweat efficiency, with higher humidity reducing its effectiveness.
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