- Biology Notes for UPSC IAS Prelims (Part I)
- Biology - Home
- Biology - Structure and Functions
- The Fundamental Unit of Life
- Biology - Tissues
- Biology - Animal Tissue
- Diversity in Living Organisms
- Biology - Plantae Kingdom
- Biology - Animalia Kingdom
- Biology - Vertebrata
- Biology - Transportation in Humans
- Biology - Transportation in Plants
- Biology - Excretion
- Biology - Control and Coordination
- Biology - Hormones in Animal
- How do Organisms Reproduce?
- Biology - Sexual Reproduction
- Biology - Reproduction in Animals
- Reaching the Age of Adolescence
- Biology - Heredity and Evolution
- Biology - Life Processes
- Biology - Respiration
- Microorganisms: Friend and Foe
- Biology - Why do We Fall Ill
- Biology - Natural Resources
- Biology - Our Environment
- Conservation of Plants and Animals
- Biology Useful Resources
- Biology Part 1 - Online Quiz
- Biology Part 1 - Online Test
- Biology Part 1 - Quick Guide
- Biology - Useful Resources
- Biology - Discussion
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Biology - Excretion
The biological process that involves in the removal of the harmful metabolic wastes from the human body is known as excretion.
Different species (organisms) use different processes for the excretion. E.g. many unicellular organisms remove their wastes by simple diffusion process from the body surface into the surrounding water.
Excretion in Human Beings
The body parts that the excretory system (of human beings) includes are −
A pair of kidneys
A pair of ureters
A urinary bladder
Kidneys are located in the abdomen (see the image given below), one on either side of the backbone.
Urine that produced in the kidneys passes through the ureters into the urinary bladder where it gets stored until released through the urethra.
On the other hand, plants have completely different process for excretion than those of animals.
Oxygen (released in the day-time) itself can be considered as a waste product generated during photosynthesis.
Many plant waste products are stored in leaves that fall off.
Some other waste products, in plants, are stored as resins and gums, especially in old xylem.