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THE CIRCULATORY SYSTEM GRADE 9 SCIENCE.pptx
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- 2. • The Processof Circulation • Importance of the Circulatory System in Daily Life • Structure and function of the circulatory system CIRCULATORY SYSTEM
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- 5. HOW IT WORKS: Theheart pumps blood through the body, carrying oxygen and nutrients.
- 6. The circulatory systemis responsible for transporting nutrients, oxygen, and waste throughout the body. It consists of three main components: the heart, blood vessels, and blood. CIRCULATORY SYSTEM
- 7. This system ensuresthat every cell receives the necessary substances to function properly while also removing waste products. CIRCULATORY SYSTEM
- 9. 1.Deoxygenated blood enters right atriumthrough superior and inferior vena cava. 2.Blood enters right ventricle through tricuspid valve. 3. Blood exits right ventricle through pulmonary valve and enters pulmonary artery. 4. Left and right pulmonary arteries send blood to lungs, where gas exchange occurs. 5. Oxygenated blood returns to heart via the pulmonary veins > enters left atrium. 6. Blood enters left ventricle through mitral valve. 7. Blood exits left ventricle through aortic semilunar valve to enter aorta. 8. Aorta distributes blood to body.
- 10. STRUCTURE AND FUNCTIONOF THE CIRCULATORY SYSTEM
- 11. THE HUMAN HEART– THE PUMP OF THE BODY The heart is a muscular organ that pumps blood throughout the body. It is divided into four chambers: • Two Atria (Top Chambers): Receive blood • Two Ventricles (Bottom Chambers): Pump blood out
- 12. BLOOD VESSELS –THE PATHWAYS Blood moves through the body in three types of blood vessels: • Arteries: Carry oxygen- rich blood away from the heart (except pulmonary artery).
- 13. BLOOD VESSELS –THE PATHWAYS • Veins: Carry oxygen-poor blood toward the heart (except pulmonary vein). • Capillaries: Tiny blood vessels that allow the exchange of gases, nutrients, and waste.
- 15. BLOOD – THETRANSPORT MEDIUM • Plasma (55%) – The liquid portion that transports nutrients and waste. • Red Blood Cells (RBCs) – Carry oxygen using hemoglobin.
- 16. BLOOD – THETRANSPORT MEDIUM • White Blood Cells (WBCs) – Defend the body from infection. • Platelets – Help in blood clotting to prevent excessive bleeding.
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- 19. 1. Pulmonary Circulation (HeartLungs Heart) → → The circulatory system is divided into two circuits: • Right side of the heart pumps oxygen-poor blood to the lungs. • In the lungs, blood absorbs oxygen and releases carbon dioxide. • Oxygenated blood returns to the left side of the heart.
- 20. 2. Systemic Circulation (HeartBody Heart) → → The circulatory system is divided into two circuits: • The left side of the heart pumps oxygen-rich blood to the entire body. • Cells receive oxygen and nutrients while releasing carbon dioxide and waste. • The oxygen-poor blood returns to the right side of the heart.
- 21. IMPORTANCE OF THECIRCULATORY SYSTEM IN DAILY LIFE
- 22. • Keeps cellsalive by delivering oxygen and nutrients. • Helps maintain body temperature and immune defense. • Supports the removal of toxins and waste products. • Essential for physical activity and overall health.
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