Activities
Pulse rate and coronary heart disease - model answers
These are suggested model answers for the activity Coronary heart disease worksheet on the page Pulse rate and coronary heart disease (2025). As model answers they don't cover all the possible options...
Activities
Adaptations of haemoglobin HL - model answers
These are suggested model answers for the activity Haemoglobin and oxygen transport - student sheet and the activity Haemoglobin and carbon dioxide transport worksheet on the page Adaptations of haemoglobin...
Activities
Blood vessels (2025)
It is estimated that the total length of all the blood vessels in the average human adult would add up to just under 97,000 km. Arteries and veins are adapted to transport blood. Capillaries are adapted...
Activities
Blood vessel - model answers
These are suggested model answers for the activity Arteries and veins micrograph worksheet As model answers they don't cover all the possible options for correct responses, but they provide a very good...
Activities
Mammalian lungs - model answers
These are suggested model answers for the activity Ventilation worksheet As model answers they don't cover all the possible options for correct responses, but they provide a very good guide for students...
Activities
Gas exchange surfaces - model answers
These are suggested model answers for the activity IB style questions - gas exchange surfaces As model answers they don't cover all the possible options for correct responses, but they provide a very...
eBook
A2.3 Virus structure - student reading Free
The most well known virus today is the Coronavirus which caused the global covid-19 pandemic between 2019 and 2023. This virus has a typical virus structure, made from genetic material (DNA or RNA) and...
Activities
Pain & consciousness HL (2025)
The skin contains many nerve endings. These can detect stimuli such as temperature changes, acid or chemicals which may lead to a sensation of pain. This page first explores how these nerve endings detect...
eBook
C2.2 Neural signalling - Student friendly summary
This is a student friendly summary list of the IB DP Biology Guide for Topic C2.2 Neural signalling Interaction and interdependence - Cells SL and HL: 3 hours AHL: 3 hours Guiding questions The movement...
Activities
Pain & consciousness HL - model answers
These are suggested model answers for the activity Pain perception worksheet As model answers they don't cover all the possible options for correct responses, but they provide a very good guide for students...