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

Disable ads (and more) with a membership for a one time $2.99 payment

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

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.

What happens in the third stage of the circulatory process?

Deoxygenated blood is removed from the body
Blood collects carbon dioxide
Oxygenated blood leaves the heart to circulate
Blood enters the lungs for gas exchange

The correct answer is: Oxygenated blood leaves the heart to circulate

In the third stage of the circulatory process, oxygenated blood leaves the heart to circulate throughout the body. This occurs after the blood receives oxygen from the lungs, where carbon dioxide is also exchanged. When the heart pumps oxygen-rich blood into the arteries, it delivers this vital resource to the various tissues and organs. Oxygen is essential for the cellular respiration process that provides energy for all bodily functions. This step is crucial as it ensures that all parts of the body receive the oxygen needed to sustain life. Other stages involve different processes: for instance, the removal of deoxygenated blood, the collection of carbon dioxide as blood returns to the heart, and the entry of blood into the lungs for gas exchange before it becomes oxygenated. Each of these stages has a specific role in maintaining the efficiency of the circulatory system and ensuring that both oxygen delivery and carbon dioxide removal happen effectively.