Controlling the Internal Environment

Controlling the Internal Environment - Controlling the...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Controlling the Internal Environment A. Introduction 1. Complex animals- need to maintain homeostasis, of interstitial fluid 2. Osmoregulation- we actively try to maintain osmotic pressure 3. Excretion- getting rid of metabolic wastes a. Urea b. CO 2 4. Elimination- undigested, unabsorbed food gets pooped out B. Metabolic Wastes 1. Carbon Dioxide- lungs 2. Nitrogenous Wastes a. Ammonia (most toxic)- fish, can excrete NH 3 because surround by H 2 O b. Uric acid (least toxic)- Birds and Reptiles least toxic, need to excrete it because of shelled embryos - birds need exclusively because of flight (no water) - reptiles need exclusively because of dry environments need to conserve water C. Osmoregulatory organs 1. Simple diffusion (Protozoa, Sponges, Cnidaria, Ctenophores), Contractile vacuoles (fresh water organism because of hypotonic environment)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
a. protonephridia- Platyhelminthes, one opening (nephridial pore), blind sac (flame cell) - main function- fluid balance, hypotonic waste (water) b. metanephridia- Annelids, Mollusks, two openings (nephridial pore, ciliated funnel) - function i. wastes, glucose, amino acids, ions, and water all enter, everything but waste reabsorbed ii. produces urine, concentrated but still hypotonic to organism. 3. Antennal glands-green glands under Antennae to pump out water
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

Page1 / 8

Controlling the Internal Environment - Controlling the...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online