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The Heart And Blood Vessels (GCSE Biology)

The following is a GCSE Biology test covering 'The Heart And Blood Vessels' from the broader topic Organisation. The test is geared towards the AQA exam board style syllabus.
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What happens to blood flow when the percentage blockage of a coronary artery increases?
How does a stent treat a blocked coronary artery?
What is the role of capillaries in tissues?
Which blood component is primarily responsible for clotting to stop bleeding?
What is the best explanation for why strenuous exercise raises heart rate?
Why do veins have valves while arteries generally do not?
What effect does nicotine in cigarette smoke have on the circulatory system?
Which measurement gives an indication of heart rate?
Which blood vessels carry blood away from the heart under high pressure?
Which chamber of the heart receives oxygenated blood from the lungs?
Which symptom is most likely if a coronary artery becomes suddenly completely blocked?