CBSE 11 Biology | 16. EXCRETORY PRODUCTS AND THEIR ELIMINATION by Pavan | Learn Smarter
K12 Students

Academics

AI-Powered learning for Grades 8–12, aligned with major Indian and international curricula.

Professionals

Professional Courses

Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.

Games

Interactive Games

Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.

Typing
Memory
Math
English Adventures
Knowledge
16. EXCRETORY PRODUCTS AND THEIR ELIMINATION

Animals accumulate various nitrogenous wastes, including ammonia, urea, and uric acid, due to metabolic processes. The excretory system plays a crucial role in eliminating these wastes and maintaining homeostasis, particularly in humans where the kidneys filter blood to produce urine through three main processes: filtration, reabsorption, and secretion. Different structures, including nephrons and various excretory organs, are vital in this process along with hormonal regulation.

Enroll to start learning

You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.

Sections

  • 16

    Excretory Products And Their Elimination

    The section discusses various excretory products and their elimination mechanisms, focusing on different nitrogenous wastes and the human excretory system.

    Learning Practice

  • 16.1

    Human Excretory System

    The human excretory system comprises kidneys, ureters, a bladder, and a urethra, performing critical roles in removing waste products and regulating bodily fluids.

    Learning Practice

  • 16.2

    Urine Formation

    Urine formation involves the processes of glomerular filtration, reabsorption, and secretion, crucial for maintaining homeostasis.

    Learning Practice

  • 16.3

    Function Of The Tubules

    The section discusses the various functions of different parts of the nephron tubules in urine formation and regulation of body fluids.

    Learning Practice

  • 16.4

    Mechanism Of Concentration Of The Filtrate

    The counter-current mechanism in the kidneys allows mammals to produce concentrated urine by maintaining a gradient of osmolarity in the medullary interstitium.

    Learning Practice

  • 16.5

    Regulation Of Kidney Function

    Kidney function is regulated through hormonal feedback mechanisms involving the hypothalamus and the juxtaglomerular apparatus (JGA).

    Learning Practice

  • 16.6

    Micturition

    Micturition is the process of urine release from the urinary bladder, coordinated by the central nervous system.

    Learning Practice

  • 16.7

    Role Of Other Organs In Excretion

    In addition to kidneys, other organs like lungs, liver, and skin play crucial roles in excreting various waste products from the body.

    Learning Practice

  • 16.8

    Disorders Of The Excretory System

    Disorders of the excretory system significantly affect the body's ability to eliminate waste, leading to severe health issues.

    Learning Practice

  • 16.9

    Summary

    The excretory system in animals eliminates nitrogenous wastes, ions, and other metabolites, with variations seen among species.

    Learning Practice

  • 16.10

    Exercises

    This section includes exercises designed to assess understanding of the excretory system concepts.

    Learning Practice

References

NCERT Study Material

Class Notes

Memorization

What we have learnt

  • Animals excrete nitrogenous...
  • The human excretory system ...
  • Kidneys function as the mai...

Final Test

Revision Tests