IB Biology Sub-topic D3.3 Notes

The last component of Topic 3, this subtopic focuses on how the body communicates between organs via hormones, maintains itself via homeostasis, and the key components involved in reproduction.

Homeostasis should be familiar as a core function of life. It is defined as the ability to maintain a constant internal environment, and this can take many forms.

In this topic, you need to learn about the homeostasis of:

1. Glucose concentration - via insulin and glucagon.
2. Thermoregulation - via thyroxine.