Respiration and Elimination of Nitrogenous Wastes — Chapter Summary
Telangana Open School (TOSS) · Class 12 · Biology
Summary of Respiration and Elimination of Nitrogenous Wastes for Telangana Open School (TOSS) Class 12 Biology.
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Overview
This chapter explores how living organisms obtain energy through respiration and eliminate harmful nitrogenous wastes produced during metabolism. It focuses on the human respiratory system and excretory system, explaining the mechanisms of gas exchange, transport of gases, and urine formation. Under
Key Concepts
Respiration is the step
Respiration is the step-wise breakdown of glucose in cells to release energy in the form of ATP. It involves gaseous exchange (oxygen in, carbon dioxi
Breathing involves inspiration (air in)
Breathing involves inspiration (air in) and expiration (air out). Inspiration is active due to diaphragm and intercostal muscle contraction; expiratio
Oxygen is mainly carried by hemoglobin
Oxygen is mainly carried by hemoglobin as oxyhemoglobin. Carbon dioxide is transported as bicarbonate ions (70%), carbamino-hemoglobin (23%), and diss
Metabolic wastes like ammonia
Metabolic wastes like ammonia, urea, and uric acid are toxic. Animals are classified as ammonotelic (ammonia), ureotelic (urea), or uricotelic (uric a
Occurs in nephrons through three steps
Occurs in nephrons through three steps: ultrafiltration in glomerulus, selective reabsorption in tubules, and tubular secretion. Useful substances are
Learning Objectives
- Define breathing, inspiration, expiration, and respiration
- Describe gaseous exchange in cockroach and humans
- Explain the exchange and transport of respiratory gases
- Understand the structure and function of the human respiratory and excretory systems
- Name common respiratory disorders and their prevention
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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