IB Biology D3.3: Homeostasis (first exams in 2025)

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here

This PowerPoint contains everything you need to teach the Theme/Unit D3.3: Homeostasis in the new IB Biology specification.

YouTube video is a preview of the full resource (does not include all slides)

This Powerpoint consists of over 50 slides and contains the followings:

• All the information the IB have included in the new spec.
• Clear diagrams
• Student friendly content
• Summary videos
• Student research tasks
• Clearly identified HL and SL content
• Student checklist
• Summary

The following content is included:

D3.3.1: Define the concept of homeostasis in relation to specific examples of variables.
D3.3.2: Explain the role of negative feedback mechanisms in maintaining homeostasis.
D3.3.3: Outline the role of pancreatic hormones in regulating blood glucose.
D3.3.4: Outline the role of negative feedback mechanisms in regulating blood glucose.
D3.3.5: Describe the physiological changes that form the basis of type 1 and type 2 diabetes.
D3.3.6: Describe the roles of thermoreceptors and hypothalamus in regulating body temperature.
D3.3.7: Outline the mechanisms in regulating human body temperature.
D3.3.8: Define osmoregulation and excretion.
D3.3.9: Explain the roles of the glomerulus, Bowman’s capsule and proximal convoluted tubule in excretion.
D3.3.10: Outline the functions of the loop of Henle and collecting ducts.
D3.3.11: Explain the effect of ADH on the permeability of the kidney tubules.
D3.3.12: Describe examples of changes in blood supply in response to changes in activity.