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Learn: The Heart and Blood Vessels
Edexcel A Level Biology SNAB A
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Welcome!Today we'll learn about the structure and function of the heart and blood vessels. This topic is essential for understanding how oxygen and nutrients are transported around the body. Let's dive in!
The HeartThe heart is a muscular organ that pumps blood throughout the body. It has four chambers: two atria (upper chambers) and two ventricles (lower chambers). The heart is critical for maintaining circulation, delivering oxygen to tissues, and removing waste products.
Which chamber of the heart pumps oxygenated blood to the body?
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Blood VesselsBlood vessels are the pathways through which blood flows. There are three main types: arteries, veins, and capillaries. Arteries carry blood away from the heart, veins carry blood towards the heart, and capillaries allow exchange of substances between blood and tissues.
Which of the following are characteristics of capillaries? (Select all that apply)
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ArteriesArteries carry blood away from the heart. They have thick, elastic walls to withstand high pressure. The largest artery is the aorta, which distributes oxygenated blood to the body.
VeinsVeins carry blood back to the heart. They have thinner walls and valves to prevent the backflow of blood. Veins often transport deoxygenated blood, except for pulmonary veins which carry oxygenated blood.
Match the items on the left with their correct pairs on the right
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Circulation PathwaysThe circulatory system has two main pathways: pulmonary circulation (blood flow between the heart and lungs) and systemic circulation (blood flow between the heart and the rest of the body). Pulmonary circulation oxygenates blood, while systemic circulation delivers oxygen to tissues.
The {{blank0}} circulation carries blood to the lungs to be oxygenated, while the {{blank1}} circulation delivers oxygenated blood to the body.
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Review Time!Great work! You've learned about the heart, blood vessels, and circulation pathways. Let's test your understanding with some review questions.
Which blood vessel carries oxygenated blood away from the heart?
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Which of the following are functions of the circulatory system? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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Well done!You’ve finished learning about the heart and blood vessels. Keep revising and practising to reinforce your understanding. Great job today!
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