Health, Disease, and Cancer

The final section of the document covers important topics related to health, disease, and cancer, which are frequently tested in AQA GCSE Biology digestive system exam questions.

Cardiovascular disease is explained, including its causes and risk factors. This information is valuable for students preparing for questions on health and disease in their GCSE exams.

Definition: Cardiovascular disease involves the build-up of fatty deposits in the coronary arteries, which can lead to blood clots and restrict oxygen supply to heart cells.

The document also covers the topic of cancer, explaining the difference between benign and malignant tumors. This information is crucial for understanding the broader implications of cellular organisation and division.

Highlight: Cancer occurs when cells begin to divide uncontrollably, leading to the formation of tumors. Malignant tumors are fast-growing, aggressive, and can spread to other parts of the body.

The section concludes with a brief mention of epidemiological studies, emphasizing the importance of studying health and illness in wider populations to identify risk factors.

This comprehensive guide serves as an excellent resource for students preparing for their GCSE AQA Biology Organisation exam questions, providing them with the knowledge and understanding needed to excel in their studies.

Enzymes and Their Activity

This section delves into the crucial role of enzymes in biological processes, a topic frequently featured in GCSE Biology organisation flashcards and exams.

The lock and key model of enzyme action is explained, providing students with a clear visual representation of how enzymes work.

Vocabulary: The lock and key model describes how an enzyme's active site is specifically shaped to fit its substrate, forming an enzyme-substrate complex.

The effects of temperature and pH on enzyme activity are thoroughly explored, with graphs illustrating these relationships. This information is essential for understanding How does temperature affect enzyme activity gcse and How does pH affect enzyme activity.

Highlight: Enzymes have an optimal temperature and pH at which they function most efficiently. Beyond these optimal conditions, enzymes become denatured and lose their functionality.

Students will find this section particularly helpful when preparing for Effect of pH on enzyme activity practical and Effect of temperature on enzyme activity practical assessments.