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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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Which blood component is primarily responsible for clotting to stop bleeding?
Which change would reduce the risk of atherosclerosis (fatty plaque formation in arteries)?
What is the best explanation for why strenuous exercise raises heart rate?
What effect does nicotine in cigarette smoke have on the circulatory system?
Where does gas exchange (oxygen into blood, carbon dioxide out) occur?
Which blood vessels carry blood away from the heart under high pressure?
Which of the following is NOT a typical feature of capillaries?
Why do veins have valves while arteries generally do not?
What is the main purpose of the coronary arteries?
Which lifestyle factor increases the risk of cardiovascular disease?
Which chamber of the heart receives oxygenated blood from the lungs?