1 / 7

Osmoregulation

Osmoregulation. Part 2. Monday. On Monday we covered 3 negative feedback loops that regulate water balance Today: we will cover some of the adaptations found in animals that live these environments Arid Wet Salt water/ marine Fresh water. Arid. Concentrated urine

amos-branch
Télécharger la présentation

Osmoregulation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Osmoregulation Part 2

  2. Monday • On Monday we covered 3 negative feedback loops that regulate water balance • Today: we will cover some of the adaptations found in animals that live these environments • Arid • Wet • Saltwater/ marine • Fresh water

  3. Arid • Concentrated urine • Long loop of Henley= more water filtered out of urine • Urine is Hypertonic- it has more solutes (urea, uric acid, ammonia) than other body fluid of the animal Reptiles • Larger number of kidney tubules which can be inactive if dehydrated (filtering of blood is slower) • Ureta empties into the cloaca where more water is reabsorbed (this is reptile/bird speak for the anus) • Dry faeces • Storage of water in other ways- eg. Camels have a higher water content in their blood. • The problem in arid areas is how to conserve water and stay cool (sweating a lot is not the best response)

  4. Wet • Osmoregulation in wet environments is not so problematic • BUT! • Single celled organisms will continue to absorb water via osmosis until they burst • UNLESS they have a contractile vacuole to expel excess water • Plants have cell walls to ensure that water absorbed stops

  5. Marine • Fish- • urine is isotonic (same amount of solutes as body fluids) • Drink sea water and secrete salts through the gills • Only a small amount of urine produced • Birds • Water reabsorbed in the cloaca • Salt excreted via salt glands above the eye

  6. Freshwater • Fish • urine is diluted= hypotonic • Don’t drink water • Frogs • Diluted urine in large quantities • Active transport of ions through the skin (to make up for those lost by diffusion) • Able to produce concentrated urine when conditions are dry

  7. Now let’s look at some examples! • See activity

More Related