Circulatory System Answer Key
Explore the structure and function of the human heart and circulatory system.
Prior Knowledge Questions
Q1.What is the main function of the circulatory system?
The circulatory system transports oxygen, nutrients, and waste products throughout the body.
Q2.How many chambers does the human heart have?
The human heart has four chambers: two atria and two ventricles.
Q3.What is the difference between arteries and veins?
Arteries carry oxygenated blood away from the heart; veins carry deoxygenated blood back to the heart.
Activity A – Blood Flow
Q1.Describe the path of blood through the heart.
Blood enters the right atrium → right ventricle → lungs (to pick up oxygen) → left atrium → left ventricle → body.
Q2.What is the role of capillaries?
Capillaries are tiny blood vessels where gas exchange occurs — oxygen moves into tissues and CO₂ moves into the blood.
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