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

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What does the double circulatory system consist of?

Heart, blood vessels, and lungs
Heart, blood vessels, and blood
Lungs, veins, and arteries
Heart, stomach, and intestines

The correct answer is: Heart, blood vessels, and blood

The double circulatory system consists of the heart, blood vessels, and blood. This system is characterized by two separate circuits: the pulmonary circuit and the systemic circuit. In the pulmonary circuit, blood is pumped from the heart to the lungs, where it picks up oxygen and releases carbon dioxide. This oxygenated blood then returns to the heart. In contrast, the systemic circuit transports oxygen-rich blood from the heart to the rest of the body, supplying organs and tissues with oxygen and nutrients, and returning deoxygenated blood back to the heart. The essential components of this system—heart, blood vessels, and blood—work together to facilitate the efficient circulation of blood throughout the body, enabling the exchange of gases, nutrients, and waste products. Other combinations such as including lungs or digestive organs would not accurately describe the constituents of the double circulatory system as they focus on either a specific component or mix systems that are not directly related to the circulatory process.