Excretory Products and their Elimination - Boards Zoology

Excretory Products and Their Elimination Excretion is the biological process of removing metabolic waste products from the body. Different organisms excrete nitrogenous wastes in various forms such as ammonia, urea, or uric acid. The human excretory system is specialized for the elimination of urea, making humans ureotelic.

Types...

What is the approximate number of nephrons present in a single human kidney?

1 million

Which mechanism is primarily responsible for producing concentrated urine in humans?

Counter current mechanism

What is the approximate number of nephrons present in a single human kidney?

1 million

Which mechanism is primarily responsible for producing concentrated urine in humans?

Counter current mechanism

What is a Nephron?

The nephron is the structural and functional unit of the kidney, responsible for filtering blood and forming urine. Also known as a Uriniferous Tubule, each kidney contains approximately 1 million nephrons. It consists of a Renal Corpuscle and Renal Tubules.

How are organisms categorized based on their primary nitrogenous waste?

Organisms are categorized as Ammonotelic (excrete highly toxic ammonia, e.g., aquatic animals), Ureotelic (excrete moderately toxic urea, e.g., mammals), or Uricotelic (excrete least toxic uric acid in paste form, e.g., birds, reptiles). Humans are ureotelic.