Eating - The trout eats little fish ingested through mouth
at anterior (left) end.
Circulation and Respiration - The trout has a closed circulatory
system with one heart.
Blood flows from the heart and picks up the carbon dioxide that is located in the tissues.
Oxygen enters the trout's
body through the mouth with water and
is exchanged with carbon dioxide in the
gills.
The water exits the body
with the carbon dioxide through
the gill slits and oxygen is transported
into the body tissues by the blood.
Digestion - The trout has a flow through digestive
system.
Food enters the body through
the mouth and is digested into feces and
monomers into the stomach.
The feces exit the body through
the anus and the monomers are transported
by the blood to the liver, which modifies them before they reach the body
tissues.
Excretion - The liquid waste
is carried by the blood to the kidneys which excrete them through the anus.
