AQA GCSE Biology revision notes
Animal tissues, organs and organ systems Revision Notes
Study Animal tissues, organs and organ systems with curriculum-aligned Revision Notes resources, practice links, and exam-focused support.
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Animal tissues, organs and organ systems
Revision notes
Normal ECG R Q T U P S mV + - P Wave Space QRS ST T PQ diagram
Specification Link
This circulation diagram is used for: Explain that the heart pumps blood around the body in a double circulatory system.
What To Explain
The heart and blood vessels work together to maintain blood flow between the lungs, body tissues and the heart.
Exam Answer Move
This links the diagram to: Explain that the heart pumps blood around the body in a double circulatory system. A strong answer follows the pathway or explains how circulation supports exchange at tissues.
Hepatomegaly Healthy liver Hepatomegaly diagram
Specification Link
This digestive system diagram is used for: Explain that bile is made in the liver and stored in the gall bladder.
What To Explain
Digestive organs and enzymes break large insoluble food molecules into smaller soluble molecules that can be absorbed.
Exam Answer Move
This is tied to: Explain that bile is made in the liver and stored in the gall bladder. The learner should explain digestion, enzymes or absorption.
Bloodstream diagram
Specification Link
This circulation diagram is used for: Explain that the heart pumps blood around the body in a double circulatory system.
What To Explain
The heart and blood vessels work together to maintain blood flow between the lungs, body tissues and the heart.
Exam Answer Move
This links the diagram to: Explain that the heart pumps blood around the body in a double circulatory system. A strong answer follows the pathway or explains how circulation supports exchange at tissues.
Conducting zone Bronchiole Bronchus Trachea Larynx Pharynx Nose diagram
Specification Link
This respiratory system diagram is used for: Describe the basic structures of the lungs that are required, including trachea, bronchi, alveoli and surrounding capillaries.
What To Explain
Efficient gas exchange depends on a large surface area, short diffusion distance and maintained concentration gradients.
Exam Answer Move
This matches the objective: Describe the basic structures of the lungs that are required, including trachea, bronchi, alveoli and surrounding capillaries. The answer should explain structure, diffusion and concentration gradients.
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