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Edexcel IGCSE Biology 复习笔记 2.9.5 Regulating Water Content in the Blood Regulating Water Content in the Blood Osmoregulation is the process of maintaining water and salt concentrations (o...
Edexcel IGCSE Biology 复习笔记 2.9.4 Kidney Structure & Function The Kidney The kidneys are located in the back of the abdomen and have two important functions in the body: They regulate...
Edexcel IGCSE Biology 复习笔记 2.9.3 The Urinary System The Urinary System: Structure Two key functions of the urinary system are: To filter waste products from the blood and expel it from t...
Edexcel IGCSE Biology 复习笔记 2.9.2 Excretion in Humans The Organs of Excretion Humans have organs that are specialised for the removal of certain excretory products Excretory organs of the...
Edexcel IGCSE Biology 复习笔记 2.9.1 Excretion The Need for Excretion in Humans Many of the necessary metabolic reactions that take place within the cells of organisms produce waste products...
Edexcel IGCSE Biology 复习笔记 2.8.11 Blood Vessels & the Circulatory System Blood Vessels There are three main types of blood vessel: Arteries Veins Capillaries Smaller vessels t...
Edexcel IGCSE Biology 复习笔记 2.8.10 The Heart Structure & Function of the Heart The heart organ is a double pump Oxygenated blood from the lungs enters the left side of the heart and i...
Edexcel IGCSE Biology 复习笔记 2.8.8 Human Transport Systems: White Blood Cells & Immunity White Blood Cells White blood cells are part of the body’s immune system These specialised cells defen...
Edexcel IGCSE Biology 复习笔记 2.8.9 Vaccinations Vaccinations Vaccines are used to induce immunity to infectious diseases A vaccine contains harmless versions of a pathogen There are severa...
