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Learn: The Heart and Blood Vessels
Edexcel A Level Biology SNAB A
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Welcome!Today we're exploring the heart and blood vessels. This lesson is designed to help you understand the structure and function of the cardiovascular system. Let's dive in!
The Cardiovascular SystemThe cardiovascular system is responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body. It includes the heart, blood vessels, and blood.
Structure of the HeartThe heart is a muscular organ that pumps blood through the circulatory system. It has four chambers: two atria (upper chambers that receive blood) and two ventricles (lower chambers that pump blood out). The heart's walls are made of cardiac muscle, which contracts to pump blood.
Which chambers of the heart pump blood out to the lungs or the rest of the body?
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Types of Blood VesselsThere are three main types of blood vessels: arteries, veins, and capillaries. Arteries carry blood away from the heart, veins carry blood back to the heart, and capillaries allow the exchange of substances between blood and tissues.
Match the items on the left with their correct pairs on the right
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Blood Flow Through the HeartBlood enters the heart through the vena cava into the right atrium, flows to the right ventricle, and is pumped to the lungs via the pulmonary artery. Oxygenated blood returns to the left atrium through pulmonary veins, moves into the left ventricle, and is pumped to the body through the aorta.
Blood leaves the heart to the lungs through the {{blank0}} and returns via the {{blank1}}.
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Valves in the HeartValves ensure blood flows in the right direction. The tricuspid valve is between the right atrium and ventricle, while the bicuspid valve (also called mitral valve) is between the left atrium and ventricle. The semilunar valves prevent backflow into the ventricles.
Which valve is found between the left atrium and ventricle?
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Review Time!Great work! You've learned about the heart's structure, valves, and blood vessels. Let's check your understanding with a few questions.
Which of the following are part of the cardiovascular system? (Select all that apply)
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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
The {{blank0}} valve prevents backflow from the left ventricle into the left atrium.
Start the lesson to answer this fill in the blank question
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