الحصة (5) - Integrated Science - الترم الثاني - الصف الأول الثانوي لغات

Lesson (5) – Metabolism, Excretion & Element Cycles in Nature | Integrated Science – Term 2 – Grade 10 💧🫁🌍

In this lesson, we study Metabolism (الأيض), Excretion (الإخراج), and the role of the Kidney (الكلى) in maintaining Homeostasis (الاتزان الداخلي). We also explain the functions of the main excretory organs, modern technological applications related to excretion, and the importance of element cycles in nature such as the carbon, nitrogen, and phosphorus cycles. The lesson connects body balance with biosphere stability in a clear scientific way ✅

Learning Objectives ✅

• Define metabolism and metabolic waste.
• Explain how kidneys filter blood and form urine.
• Identify the excretory role of skin, liver, lungs, and kidneys.
• Recognize technological applications used in excretion and diagnosis.
• Describe carbon, nitrogen, and phosphorus cycles in nature.

Lesson Parts 🎬

• Part 1: Metabolism and kidney
• Part 2: Excretory organs
• Part 3: Technological applications on excretion
• Part 4: Element cycles in nature

Organized Content 📌

• 1) Metabolism and excretion
  • Metabolism is the group of biochemical processes that take place inside cells.
  • Metabolic waste must be removed to maintain homeostasis.
• 2) Kidney
  • The kidneys filter blood, remove liquid waste, and help regulate water and ions.
  • Useful substances are returned to blood by reabsorption (إعادة الامتصاص).
• 3) Excretory organs
  • Skin removes water, salts, and small amounts of urea through sweat.
  • The liver helps remove harmful substances and process some wastes.
  • The lungs remove carbon dioxide and water vapor during exhalation.
• 4) Technological applications
  • Examples include the bio-artificial kidney, ultrasound, and infrared thermography.
• 5) Element cycles in nature
  • Carbon, nitrogen, and phosphorus cycles recycle important elements between organisms and the environment.

Common Mistakes ⚠️

• Confusing metabolism with excretion.
• Thinking kidneys remove all filtered materials without reabsorption.
• Ignoring the excretory role of skin, liver, and lungs.

By the end of the lesson… you can explain excretion, kidney function, and how element cycles support biosphere stability ✅