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Learn: The Heart and Blood Vessels
Edexcel A Level Biology SNAB A
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Welcome!Today we'll explore the heart and blood vessels, a key part of the cardiovascular system. This lesson is tailored to help you understand their structure and function step by step.
The Cardiovascular SystemThe cardiovascular system transports blood around the body. It includes the heart, blood vessels, and blood. This system delivers oxygen and nutrients to cells and removes waste products like carbon dioxide.
The HeartThe heart is a muscular organ that pumps blood. It has four chambers: two atria on top and two ventricles below. This division ensures oxygenated and deoxygenated blood do not mix, making circulation more efficient.
Quick check: How many chambers does the heart have?
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Blood VesselsBlood vessels are pathways for blood to travel. They include arteries (carry blood away from the heart), veins (return blood to the heart), and capillaries (exchange substances with tissues).
The {{blank0}} carry blood away from the heart, while the {{blank1}} return blood to the heart.
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ArteriesArteries have thick, muscular walls to withstand high pressure. They transport oxygenated blood (except the pulmonary artery) from the heart to the rest of the body.
VeinsVeins have thinner walls and valves to prevent backflow. They carry deoxygenated blood (except the pulmonary vein) back to the heart at lower pressure.
Match the items on the left with their correct pairs on the right
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CapillariesCapillaries are tiny blood vessels with very thin walls. They enable the exchange of oxygen, nutrients, and waste products between blood and tissues.
Review Time!Great work! You've learned about the heart and blood vessels. Let's test your understanding with a few questions.
Which of the following are true about the heart and blood vessels? (Select all that apply)
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Which blood vessel has the thickest walls?
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The heart pumps oxygenated blood out through the {{blank0}}.
Start the lesson to answer this fill in the blank question
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