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

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What is the result of ventricles contracting?

Blood is pushed into the lungs
Blood is forced into the pulmonary artery and aorta
Blood returns to the atria
Blood cools down before circulating again

The correct answer is: Blood is forced into the pulmonary artery and aorta

When the ventricles contract, it is known as ventricular systole, which is a critical part of the cardiac cycle. During this phase, the pressure within the ventricles increases dramatically as the heart muscle contracts. The main function of the ventricles is to pump blood to the body and the lungs, and this contraction forces blood out into the pulmonary artery and the aorta. The pulmonary artery carries blood towards the lungs for oxygenation, while the aorta distributes oxygenated blood throughout the rest of the body. The effectiveness of this contraction is what ensures that blood is circulated effectively, delivering oxygen and nutrients to tissues while removing waste products. This process is vital for maintaining the flow of blood in the circulatory system and is paramount for sustaining life. The other options center around different aspects of the cardiovascular system but do not accurately describe the direct outcome of ventricular contraction, which is the ejection of blood from the heart into the arterial system.