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

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Prepare for the OCR GCSE Biology Exam with detailed quizzes, flashcards, and explanations. Enhance your understanding of biology concepts and get exam-ready today!

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What do capillaries branch into?

Arteries
Veins
Venules
Arterioles

The correct answer is: Venules

Capillaries are the smallest blood vessels in the body, and they serve as the sites for the exchange of oxygen, carbon dioxide, nutrients, and waste products between the blood and tissues. After blood has passed through the capillaries and delivered its nutrients and oxygen to surrounding tissues, it returns to the circulatory system through a series of small vessels that combine to form larger ones. Capillaries branch into venules, which are small vessels that collect deoxygenated blood from the capillaries. Venules then converge to form larger veins, eventually leading the blood back to the heart. This process ensures that all the blood that has delivered vital substances to tissues is efficiently collected and returned to the heart for reoxygenation. Understanding this sequence is crucial for grasping how the circulatory system functions as a whole.