🫀 ROLE OF THE CIRCULATORY SYSTEM
(Grade 10 – New Zealand Curriculum Study Notes) Name of the Student : SARAH
🌐 What is the Circulatory System?
The circulatory system is the transport system of the human body. It is responsible for moving blood, nutrients, oxygen, carbon dioxide, and hormones to and from the cells.
It is made up of three main parts:
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Heart
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Blood Vessels (arteries, veins, capillaries)
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Blood
💡 Key Functions of the Circulatory System
| Function | Description |
|---|---|
| Transporting Oxygen | Delivers oxygen from the lungs to all body cells through red blood cells. |
| Transporting Nutrients | Carries nutrients from the digestive system to body cells. |
| Removing Waste Products | Carries carbon dioxide to the lungs and waste products to the kidneys. |
| Circulating Hormones | Distributes hormones from glands to organs to control body functions. |
| Protecting the Body | White blood cells fight infection; platelets help in clotting. |
| Regulating Body Temperature | Helps maintain constant internal temperature (homeostasis). |
🫀 Role of the Heart
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Acts as a pump that pushes blood around the body.
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Has four chambers: left atrium, left ventricle, right atrium, right ventricle.
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Pumps oxygenated blood to the body and deoxygenated blood to the lungs.
🩸 Role of Blood Vessels
| Type | Role |
|---|---|
| Arteries | Carry oxygen-rich blood away from the heart. |
| Veins | Carry oxygen-poor blood towards the heart. |
| Capillaries | Tiny vessels where gas and nutrient exchange occurs between blood and cells. |
📌 Summary
The circulatory system ensures that every cell in the body gets the oxygen and nutrients it needs and that waste products are removed efficiently. It also plays a protective and regulatory role, keeping the internal environment stable.
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