IB Biology C3.1: Integration of body systems (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 C3.1 Integration of body systems in the new IB Biology specification.

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This Powerpoint consists of over 100 slides and contains the followings:

All the information the IB have included in the new spec.

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Summary

The following content is included:

C3.1.1: Describe the importance of integration of body systems.
C3.1.2: Explain the hierarchy of biological organisation.
C3.1.3: Compare the roles of the nervous system and endocrine system in signalling.
C3.1.4: Describe the roles of the brain and spinal cord in processing information.
C3.1.5: Compare the roles of sensory and motor neurons.
C3.1.6: Examine a transverse section of a myelinated nerve.
C3.1.7: Describe the structure of a pain reflex arc.
C3.1.8: Explain the role of the cerebellum in coordination and balance.
C3.1.9: Explain the impact of melatonin on circadian rhythms.
C3.1.10: Analyse the effects of epinephrine on the body.
C3.1.11: Describe the feedback mechanisms that regulate the functioning of the endocrine system.
C3.1.12: State the role of baroreceptors and chemoreceptors in the feedback control of the heart rate.
C3.1.13: Describe the role of chemoreceptors in controlling the rate of ventilation.
C3.1.14: Outline the mechanism for peristaltic control by the CNS and ENS.
C3.1.15: Observe tropic responses in seedlings.
C3.1.16: Describe positive phototropism.
C3.1.17: Outline the functions of the different types of phytohormones.
C3.1.18: Explain the movement and concentration of auxins within plant cells.
C3.1.19: Describe the role of auxins in cell growth.
C3.1.20: Study the regulation of root and shoot growth by the interaction between cytokinins and auxins.
C3.1.21: Explain the positive feedback mechanism in the production of ethylene by ripening fruit.