The diagram shows the route taken by a red blood cell after it leaves the right side of a human heart. A science club is making a display to explain why hum...
Question 1 Report
The diagram shows the route taken by a red blood cell after it leaves the right side of a human heart. A science club is making a display to explain why humans have a double circulatory system. The red blood cell first travels to the lungs, where oxygen enters the blood. It then returns to the heart before travelling to muscles and other body cells. The club uses arrows to show the direction of blood flow. Their display is intended for younger students who know that cells need oxygen for aerobic respiration.
(a) Identify the blood vessel labelled Y. [1]
(b) Identify the organ labelled Z. [1]
(c) Explain why blood returns to the heart after travelling through the lungs. [2]
Answer Details
(a) Y is the pulmonary artery. [1]
(b) Z is the lung / lungs. [1]
(c) Blood returning from lungs is oxygenated. [1] The heart pumps it at high pressure to the rest of the body / body cells. [1]
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