Question

What is excretion? Describe the structure and working of nephron?

Answer 1

Answer:

Excretion is a process by which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys and skin.[1] This is in contrast with secretion, where the substance may have specific tasks after leaving the cell. Excretion is an essential process in all forms of life. For example, in mammals urine is expelled through the urethra, which is part of the excretory system. In unicellular organisms, waste products are discharged directly through the surface of the cell.

Answer 2

Excretion :

• Excretion is the process of removing or excrete the nitrogenous and waste material from the body.
• It is different in different living organsims.

Nephron :

• Nephron is the basic structure of kidney and it plays vital role in the body.
• It has many functions like to seperate water, ions and blood.
• Its main function is also in the process of excretion.
• It converts the useless blood which is not helpful for any process in the body and then it is converted into urine by the nephron.
• It is said as the structural and functional unit of kidney.