Ch 16 - Excretory Products and their Elimination11th Biology
Osmoregulation vs. Excretion
Define the term 'Osmoregulation' and explain how it fundamentally differs from 'Excretion'.
Define the term 'Osmoregulation' and explain how it fundamentally differs from 'Excretion'.
- Osmoregulation: The active regulation of the osmotic pressure of an organism's body fluids to strictly maintain the homeostasis of water and ionic content.
- Excretion: The biological process of isolating and eliminating metabolic waste products (especially toxic nitrogenous wastes) from the body.
Note: Biological structures like protonephridia and kidneys usually perform both functions simultaneously.
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Ammonotelism
What is ammonotelism, and why do organisms that excrete ammonia strictly require an aquatic environment?
What is ammonotelism, and why do organisms that excrete ammonia strictly require an aquatic environment?
- Definition: The process of excreting Ammonia as the primary nitrogenous waste.
- Toxicity & Water Requirement: Ammonia is the most toxic form of nitrogenous waste and requires exceptionally large amounts of water for its safe elimination.
- Mechanism: It is highly soluble and generally excreted by simple diffusion across body surfaces or gill surfaces (as ammonium ions).
- Examples: Many bony fishes, aquatic amphibians, and aquatic insects.
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Ureotelism
How do terrestrial mammals and marine fishes adapt to conserve water while excreting nitrogenous waste?
How do terrestrial mammals and marine fishes adapt to conserve water while excreting nitrogenous waste?
- Adaptation (Ureotelism): They excrete Urea, which is much less toxic than ammonia and requires significantly less water for elimination.
- Mechanism: Ammonia produced by cellular metabolism is converted into urea strictly within the Liver (via the Ornithine cycle). It is then released into the blood, filtered, and excreted by the kidneys.
- Note: A small amount of urea may be retained in the kidney matrix to maintain a desired high osmolarity.
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Also in this chapter
46 more cards to study in Prism
- 4Uricotelism
- 5Aminotelism & Guanotelism
- 6Protonephridia (Flame Cells)
- 7Anatomy of Human Kidneys
- 8Nephridia & Malpighian Tubules
- 9Antennal (Green) Glands
- 10Renal Cortex & Medulla
- 11The Nephron
- 12Pathway of the Renal Tubule
- 13Types of Nephrons
- 14Vasa Recta
- 15Renal Blood Flow
- 16Net Filtration Pressure (NFP)
- 17Glomerular Filtration Rate (GFR)
- 18Filtration Fraction (FF)
- 19Ultrafiltration Process
- 20The Filtration Membrane
- 21Tubular Reabsorption Overview
- 22Tubular Secretion
- 23Functions of the PCT
- 24Permeability of Henle's Loop & Reabsorption
- 25Functions of the DCT
- 26The Collecting Duct
- 27Countercurrent Mechanism: The Setup
- 28Medullary Osmolarity Gradient & Recycling
- 29RAAS Biochemical Pathway
- 30Anatomical Formation & Activation of JGA
- 31Role of Aldosterone in RAAS
- 32Hypothalamic Regulation (ADH)
- 33Atrial Natriuretic Factor (ANF)
- 34The Micturition Reflex
- 35Physical & Chemical Properties of Urine
- 36Clinical Indicators in Urine
- 37Excretory Role of Lungs
- 38Excretory Role of the Liver
- 39Sweat vs. Sebaceous Glands
- 40Minor Excretory Role of Saliva
- 41Uremia
- 42Haemodialysis Mechanism
- 43Renal Hilum & Pelvis
- 44Kidney Transplantation
- 45Renal Calculi (Kidney Stones)
- 46Glomerulonephritis
- 47Diabetes Insipidus vs. Diabetes Mellitus
- 48Haemodialysis: Returning the Blood
- 49The Ornithine Cycle (Urea Cycle)
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