OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Study for the OCR GCSE Biology Exam. Use multiple choice questions and quiz flashcards with explanations and hints. Excel in your exams!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Why is the heart muscle particularly rich in mitochondria?

To store oxygen
To provide ATP for energy
To cool down after contraction
To aid in repairing tissue

The correct answer is: To provide ATP for energy

The heart muscle is particularly rich in mitochondria to provide ATP for energy. The heart continuously pumps blood to distribute oxygen and nutrients throughout the body, which requires a significant amount of energy. Mitochondria are the cell's powerhouse, where aerobic respiration occurs, allowing the conversion of glucose and oxygen into ATP (adenosine triphosphate). This ATP is essential for the muscle contractions that enable the heart to function effectively. The high density of mitochondria in heart muscle cells supports the sustained energy demands, ensuring that the heart can maintain a consistent rhythm and respond to the body's needs for blood circulation, especially during periods of increased physical activity.