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!

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What is the primary function of the circulatory system?

To aid in digestion
To transport oxygen to cells
To regulate body temperature
To produce hormones

The correct answer is: To transport oxygen to cells

The primary function of the circulatory system is to transport oxygen to cells throughout the body. This system, which includes the heart, blood, and blood vessels, is vital for maintaining cellular respiration, a process where cells use oxygen to produce energy. As blood circulates, it picks up oxygen from the lungs and delivers it to various tissues, ensuring that cells have the necessary resources to function effectively. This process also involves the removal of carbon dioxide, a waste product of cellular respiration, from the cells and transporting it back to the lungs for exhalation, thereby aiding in maintaining homeostasis. While the circulatory system does play roles in other functions, such as helping with the transport of nutrients and waste products, its primary and essential role centers around oxygen transportation.