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!

Practice this question and more.

After the blood has flowed to the organs, where does it go next?

It returns to the heart through the veins
It gets re-oxygenated in the lungs first
It remains in the organs
It is stored indefinitely in the body

The correct answer is: It returns to the heart through the veins

After the blood has circulated through the organs and delivered oxygen and nutrients, it returns to the heart through the veins. This is a crucial part of the circulatory system, which operates in a closed loop. Once the blood has delivered its oxygen to the tissues, it picks up carbon dioxide and other metabolic wastes. This deoxygenated blood is then collected by small veins, which gradually merge into larger veins, eventually leading back to the right atrium of the heart. From there, the heart can pump the blood to the lungs for re-oxygenation. The other options do not accurately reflect the processes in the circulatory system. While the blood does ultimately go to the lungs for oxygenation, that process happens after it returns to the heart, and blood does not remain indefinitely in the organs nor is it stored there without being processed further. The return to the heart is essential for maintaining the continuous flow of blood throughout the body.