Respiratory system
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Respiratory System:. Purpose: - exchange O 2 and CO 2 between an organism and its environment -fish use their mouths to breath and not nostrils. Respiration:. -Occurs in a fish’s gills -gills are located on the sides of a fish’s head.

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Respiratory system

Respiratory System:

  • Purpose:

    - exchange O2 and CO2 between an organism and its environment

    -fish use their mouths to breath and not nostrils.


Respiration

Respiration:

-Occurs in a fish’s gills

-gills are located on the sides of a fish’s head

• Gills have a large surface area which allow for rapid exchange of oxygen and carbon dioxide


Respiratory system

• Each gill is composed of 4 gill arches

-a gill arch is a curved, cartilaginous

bone

-on the outside of each arch is a double row of thin projections called gill filaments.


Respiratory system

Gill filaments are feathery structures which increase the surface area of the gill for gas exchange.

Each filament contains many blood vessels


Respiratory system

Gill arches also have gill rakers

-located on the inside of the gill arch.

-rakes out or filters out food, preventing food from entering the gills.


Respiratory system

Water enters the mouth and is pumped over the gills.

Water flows over the filaments which are loaded with blood vessels.

The dissolved oxygen from

the water diffuses into the

blood.

Blood transports oxygen

to the cells.


Respiratory system

Cells take in oxygen and release carbon dioxide as a waste.

Carbon dioxide enters blood and is transported back to the gills where it is released into the water

The operculum

covers the gills.


Excretory system

Excretory System:

  • Purpose: to remove nitrogenous waste (ammonia) from the blood which is created by the cells going through metabolism

Kidney

Urogenital opening


Respiratory system

1. Blood containing ammonia can pass through the gills and be excreted out into the water.

OR

2. A fish’s kidney can filter out the ammonia and convert it into a less toxic urea along with excess water and salt.


Respiratory system

Urea, excess water and salt collect and stored in the urinary bladder as urine.

Urine is then released out the body through the urogenital opening.

Urinary bladder


Respiratory system

High

Low

Water moves from high to low.

A large amount of water moves into the fresh water fish from its environment. Therefore they excrete large amounts of urine constantly.

Low

Low

Only a small amount of water moves into the salt water fish from its environment. Therefore they excrete very small amounts of urine.


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