Excretion, Form 3 Biology, Topic 4, Dr. Mlelwa

Excretion is the process by which waste products of metabolism and other non-useful materials are eliminated from an organism.

Advanced 0(0 Ratings) 3 Students enrolled English-and-swahili
Created by Dr. Mlelwa
Last updated Sat, 25-Nov-2023
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Course overview
Chemical reactions occur in the cells of living organisms all the time to carry out the life processes. The sum of these reactions is called metabolism. Metabolism produces useful products as well as toxic (poisonous) by-products.
These toxic substances have to be removed as they are harmful if allowed to accumulate. The removal of metabolic waste products from the body of an organism is known as excretion.
The major excretory products are carbon dioxide, excess water, and nitrogenous compounds like ammonia, urea, uric acid, etc. Carbon dioxide and water are produced in the process of tissue respiration. Nitrogenous compounds are formed from the breakdown of proteins and amino acids. Water and salts in excess of the body’s needs are also excreted.
Other excretory products include chemicals from medicines, toxic substances, and circulating hormones that have already served their purpose. We will learn how metabolic wastes get eliminated.
In concise, excretion is the process by which waste products of metabolism and other non-useful materials are eliminated from an organism.

What will i learn?

  • concept of excretion, the excretory materials, the kidney, the nephrone, process of urine formation
Requirements
  • silent room for studying, biology book or good notes, pen, pencil, exercise book
Curriculum for this course
9 Lessons 02:40:37 Hours
Excretion
9 Lessons 02:40:37 Hours
  • Concept of excretion
    Preview 00:18:33
  • Excretory products
    00:11:25
  • The kidney
    00:19:56
  • The internal structure of the kidney
    00:12:44
  • The nephrone
    00:24:12
  • Mechanism of urine formation
    00:19:46
  • Disorders of excretory system
    00:16:29
  • The liver as excretory organ
    00:15:43
  • Excretion in plants
    00:21:49
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About instructor

Dr. Mlelwa

Dr. Mlelwa is an experienced online tutor in biology and chemistry from ordinary level to advanced level. His highest level of education is two years of doctor of medicine (MD) at Muhimbili university of Health and allied science in from Nov 2018 to Sept 2020. There after he failed to continue with Doctor of Medicine Studies due to several reasons which are out of scope of this description. He started online teaching since January 2020 in his YouTube channel (Dr.Mlelwa Lectures) by that time he was still a medical student dreaming to become one among the best tutor in medical studies, that's why he called the channel Dr. Mlelwa Lectures, comparing to Dr. Najeeb Lectures who was one of his role mode. His good performance, being the second best boy in advanced biology examinations national wise in 2018, made him one among most interesting online tutor, having influence to different students inside Tanzania as well as abroad.

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Naitwa Helbeth Issack Mlelwa. Siku ya ijumaa, March 13, 1998, historia na kumbukizi za wazazi wangu zinasema kwamba ndio siku ambayo nilizaliwa na nafsi yangu ikaonja pumzi ya duni...
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