Based on the provided diagram of the human circulatory system, here is the solution to the questions:
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1. Use the above diagram and write the correct part’s letter(s).
a) Write down three letters that show arteries:
A, B, F
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Explanation: Arteries carry blood *away* from the heart.
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A points to the aorta, the main artery leaving the left side of the heart, carrying oxygenated blood to the body.
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B points to the pulmonary artery, which carries deoxygenated blood away from the right side of the heart to the lungs.
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F points to the carotid arteries in the neck, which carry oxygenated blood from the aorta to the brain.
b) Write down one letter that shows capillaries:
C
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Explanation: Capillaries are the tiny, thin-walled vessels where gas and nutrient exchange occurs between the blood and tissues. The diagram uses
C to label the network of capillaries surrounding the "other organs" at the bottom of the torso, representing this exchange site.
c) Write down two letters that show veins:
D, E
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Explanation: Veins carry blood *towards* the heart.
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D points to the superior vena cava, which returns deoxygenated blood from the upper body (head, arms) to the right atrium of the heart.
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E points to the jugular veins in the neck, which return deoxygenated blood from the head/brain to the superior vena cava.
d) Write down three letters that show vessels containing deoxygenated blood:
B, D, E
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Explanation: Deoxygenated blood is blood that has delivered its oxygen to the tissues and is returning to the heart to be re-oxygenated in the lungs.
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B (Pulmonary artery): Carries deoxygenated blood from the right ventricle to the lungs.
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D (Superior vena cava): Carries deoxygenated blood from the upper body back to the right atrium.
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E (Jugular veins): Carry deoxygenated blood from the head/brain towards the superior vena cava (and ultimately the heart).
*(Note: While A and F carry oxygenated blood, and C represents capillaries where blood becomes deoxygenated, the question specifically asks for vessels. B, D, and E are the clear vessels shown carrying deoxygenated blood.)*
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Parent Tip: Review the logic above to help your child master the concept of human circulatory system worksheet.
