3-4_Excretory_part_2

3-4_Excretory_part_2 - EXCERTORY SYSTEM Three major...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
EXCERTORY SYSTEM Three major processes create urine Filtration Reabsorption Secretion
Background image of page 1

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

View Full DocumentRight Arrow Icon
Filtration Body fluids (blood in vertebrates) is exposed to a filtering device made of selectively permeable membranes of transport epithelia Hydrostatic pressure (blood pressure in most animals) forces water and small solutes through the epithelia Salts Sugars Amino acids Nitrogenous wastes
Background image of page 2
Reabsorption Some solutes are selectively transported (both passively and actively) back into the body fluids. This is important for conserving resources. Glucose Salts Amino acids N-wastes are left in the filtrate to leave the body
Background image of page 3

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

View Full DocumentRight Arrow Icon
Secretion Excess salts, toxins, and other solutes are removed from the body fluids and added to the filtrate (urine)
Background image of page 4
5 Types of Excretory Organs protonephridia – flatworms, rotifers, some annelids, mollusk larvae, lancelets Metanephridium – annelids (segmented worms) Malpighian tubules – insects, terrestrial arthropods Kidney - vertebrates
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/16/2011 for the course BIO 102 taught by Professor Brey during the Fall '08 term at Rutgers.

Page1 / 13

3-4_Excretory_part_2 - EXCERTORY SYSTEM Three major...

This preview shows document pages 1 - 6. Sign up to view the full document.

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