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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, vital parts of the cardiovascular system. Let's learn how they work together to transport blood around the body.
The HeartThe heart is a muscular organ that pumps blood. It has four chambers: two atria (upper chambers) and two ventricles (lower chambers). Blood flows in one direction due to valves that prevent backflow.
Quick check: How many chambers does the heart have?
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Blood VesselsBlood vessels are tubes that carry blood. There are three main types: arteries (carry blood away from the heart), veins (carry blood back to the heart), and capillaries (small vessels for exchange of substances).
Match the items on the left with their correct pairs on the right
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CirculationBlood is pumped from the heart into arteries, travels to capillaries for exchange, and returns via veins. This ensures oxygen and nutrients reach tissues while waste products are removed.
In the circulatory system, {{blank0}} carry blood away from the heart, while {{blank1}} return it.
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Cardiac CycleThe cardiac cycle describes the sequence of events in one heartbeat. It includes systole (contraction) and diastole (relaxation). Blood is pumped during systole and fills the chambers during diastole.
Quick check: What happens during systole?
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Types of CirculationThe body has two main circulatory systems: pulmonary circulation (between heart and lungs) and systemic circulation (between heart and rest of the body). Pulmonary circulation allows oxygenation of blood, while systemic circulation delivers oxygen-rich blood to tissues.
Which statements about circulation are true? (Select all that apply)
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Review Time!Great work! You've learned about the heart, blood vessels, circulation, and the cardiac cycle. Let's test your understanding.
What prevents backflow in veins?
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The {{blank0}} cycle includes systole and diastole.
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Match the items on the left with their correct pairs on the right
Start the lesson to answer this matching question
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