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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 structure and function of the heart and blood vessels. This is an essential topic in understanding how blood circulates and delivers oxygen and nutrients to the body.
The HeartThe heart is a muscular organ that pumps blood throughout the body. It works continuously to maintain circulation, delivering oxygen and nutrients while removing waste like carbon dioxide.
Heart ChambersThe heart has four chambers: two atria (upper chambers) and two ventricles (lower chambers). Atria receive blood, while ventricles pump blood out to the lungs or the rest of the body.
Which of these chambers pumps blood out to the body?
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Heart ValvesThe heart includes valves to prevent backflow of blood. Examples include the tricuspid valve (between right atrium and right ventricle) and the mitral valve (between left atrium and left ventricle).
The {{blank0}} valve prevents backflow between the left atrium and left ventricle.
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Blood VesselsBlood vessels are the tubes that carry blood throughout the body. There are three main types: arteries, veins, and capillaries.
Match the items on the left with their correct pairs on the right
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Blood PressureBlood pressure is the force exerted by circulating blood on the walls of blood vessels. It is measured in mmHg and consists of two values: systolic (pressure during heart contraction) and diastolic (pressure during relaxation).
Which value in blood pressure measurement shows pressure during heart contraction?
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Coronary ArteriesCoronary arteries are blood vessels that supply oxygenated blood to the heart muscle itself. Blockages in these arteries can lead to heart attacks.
Select all functions of blood vessels:
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Review Time!Great work! You've learned about the heart, its chambers, valves, blood vessels, and related processes. Let's test your understanding.
What is the main role of coronary arteries?
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The {{blank0}} blood vessels carry blood under high pressure from the heart.
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Which of the following are characteristics of veins? (Select all that apply)
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