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Questions and Answers
What prevents blood from flowing back from the ventricles into the atria?
What prevents blood from flowing back from the ventricles into the atria?
Why are mammals described as having a 'double circulatory system'?
Why are mammals described as having a 'double circulatory system'?
Which vessel carries blood from the right ventricle to the lungs for oxygenation?
Which vessel carries blood from the right ventricle to the lungs for oxygenation?
During which stage of the cardiac cycle do the atria contract and blood flows out of them into the ventricles?
During which stage of the cardiac cycle do the atria contract and blood flows out of them into the ventricles?
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What is the function of semilunar valves in the heart?
What is the function of semilunar valves in the heart?
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Which vessel is responsible for carrying oxygenated blood from the lungs to the left atrium of the heart?
Which vessel is responsible for carrying oxygenated blood from the lungs to the left atrium of the heart?
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Which blood vessels carry oxygenated blood away from the heart?
Which blood vessels carry oxygenated blood away from the heart?
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What is the function of valves in blood vessels?
What is the function of valves in blood vessels?
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Why is the lumen of arteries relatively small?
Why is the lumen of arteries relatively small?
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Which type of blood vessel has walls that are one cell thick?
Which type of blood vessel has walls that are one cell thick?
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What is the main difference between arteries and veins in terms of pressure?
What is the main difference between arteries and veins in terms of pressure?
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Why are capillaries highly branched with a large surface area?
Why are capillaries highly branched with a large surface area?
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What is the initial event that triggers the formation of blood clots?
What is the initial event that triggers the formation of blood clots?
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Which factor causes prothrombin to change to thrombin in the blood clotting process?
Which factor causes prothrombin to change to thrombin in the blood clotting process?
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What can a build-up of fibrous plaque in an artery lead to?
What can a build-up of fibrous plaque in an artery lead to?
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What is the main purpose of blood clots in the body?
What is the main purpose of blood clots in the body?
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What condition is caused by blood clots forming inside blood vessels?
What condition is caused by blood clots forming inside blood vessels?
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What change do platelets undergo when they come into contact with a damaged blood vessel wall?
What change do platelets undergo when they come into contact with a damaged blood vessel wall?
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