Osmoregulation in Animals

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Presentation transcript:

Osmoregulation in Animals Chapter 44

Osmoconformers vs. Osmoregulators

How does a salmon survive? Usually osmoregulation uses about 5% of metabolism. Osmoregulation in extreme saline conditions: up to 30%

Key functions of osmoregulation Get rid of nitrogeneous waste What are the advantages/disadvant ages of types of waste? Retain water How does the kangaroo rat survive?

Processes Filtration Reabsorption Secretion Excretion Gets rid of waste; yet retains key materials!

Mammalian Excretory System

Functional Unit: Nephron 99% of water is reabsorbed! 1000 L pass through kidney to make 1.5L of urine each day!

Describe how the filtrate changes…

Key Concept: Active transport drives the passive transport of water

Hormonal Balance Two systems: What is the stimulus for each system? What hormones are involved? How do hormones cause a response?

ADH

RAAS

Reviewing Hormones Mini Case Study: Alcohol inhibits ADH. A college student was binge drinking. The student passed out and friends just figured they’d let him “sleep it off.” Knowing what you know about the feedback and osmoregulation, why is this a bad choice?

Compare and Contrast Osmoregulation in saltwater vs. freshwater fish!

Compare and Contrast the Following Excretory Organs Name of Structure Organisms How structure works Protonephrida Metanephridia Malphigian Tubules

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