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Respiration and Elimination of Nitrogenous Wastes

Telangana Open School (TOSS) · Class 12 · Biology

Quick revision notes for Respiration and Elimination of Nitrogenous Wastes — Telangana Open School (TOSS) Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Respiration and Breathing

  • Respiration is the step-wise oxidation of glucose to release energy in the form of ATP.
  • Breathing involves two phases: inspiration (taking in air) and expiration (releasing air).
  • In humans, gaseous exchange occurs in the alveoli of the lungs.
2

Gas Transport in Blood

  • Oxygen is mainly transported as oxyhaemoglobin in red blood cells.
  • About 97% of oxygen binds with haemoglobin; only 3% dissolves in plasma.
  • Carbon dioxide is transported in three forms: dissolved in plasma (5–7%), as carbamino-haemoglobin (23%), and as bicarbonate ions (70%).
3

Excretion and Nitrogenous Wastes

  • Excretion is the removal of metabolic waste products, especially nitrogenous wastes like ammonia, urea, and uric acid.
  • Animals are classified as ammonotelic, ureotelic, or uricotelic based on their main nitrogenous waste.
  • Human kidneys filter blood and form urine through ultrafiltration, selective reabsorption, and tubular secretion.
4

Structure and Function of the Kidney

  • The human excretory system includes kidneys, ureters, urinary bladder, and urethra.
  • Each kidney contains about 1 million nephrons.
  • Urine formation involves three steps: ultrafiltration, selective reabsorption, and tubular secretion.

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Full Notes

Key Concepts

Respiration is the stepBreathing involves inspiration (air in)Oxygen is mainly carried by hemoglobinMetabolic wastes like ammoniaOccurs in nephrons through three steps

Frequently Asked Questions

What are the important topics in Respiration and Elimination of Nitrogenous Wastes for Telangana Open School (TOSS) Class 12 Biology?
Respiration and Elimination of Nitrogenous Wastes covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Respiration and Elimination of Nitrogenous Wastes — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 48 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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