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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 fascinating structure of the heart and blood vessels. This lesson will help you understand their function and importance in the circulatory system.
The Circulatory SystemThe circulatory system transports oxygen, nutrients, and waste products throughout the body. The heart pumps blood, while blood vessels act as pathways for circulation.
The Structure of the HeartThe heart is a muscular organ divided into four chambers: two atria (upper) and two ventricles (lower). It pumps blood through two circuits: the pulmonary circuit (lungs) and the systemic circuit (body).
Which chambers of the heart receive blood?
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Blood VesselsThere are three main types of blood vessels: arteries, veins, and capillaries. Arteries carry blood away from the heart, veins return blood to the heart, and capillaries enable exchange of substances between blood and tissues.
Match the items on the left with their correct pairs on the right
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Valves in the HeartThe heart contains valves to ensure blood flows in the right direction. The atrioventricular valves separate atria from ventricles, while semilunar valves prevent backflow from arteries into ventricles.
Which of the following are true about heart valves? (Select all that apply)
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Blood Flow Through the HeartBlood enters the right atrium from the body, flows to the right ventricle, and is pumped to the lungs. Oxygenated blood returns to the left atrium, flows to the left ventricle, and is pumped to the rest of the body.
Blood is pumped from the {{blank0}} ventricle to the lungs and from the {{blank1}} ventricle to the body.
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The Cardiac CycleThe cardiac cycle is 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.
What happens during systole in the cardiac cycle?
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Review Time!Great work! You've learned about the heart, blood vessels, and the circulatory system. Let’s consolidate your understanding with a few questions.
Which statements about the circulatory system are true? (Select all that apply)
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Which valve prevents backflow from the aorta into the heart?
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The {{blank0}} circuit pumps blood to the lungs, while the {{blank1}} circuit pumps blood to the body.
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