The Earthworm
The earthworm has a closed circulatory system, which means
that the blood is confined to blood vessels and the blood is
recirculated. An earthworm has neither lungs nor gills
but uses its body's great surface area to absorb oxygen from the soil. The
oxygen is taken in by the dorsal blood vessel and travels to the five hearts
by the esophogus where it is pumped to the lower, ventral blood
vessel. The ventral blood vessel pumps the blood to all segments and organs in
need of oxygen. In each segment, there is a small blood vessel that sends the
blood from the ventral blood vessel back to the dorsal blood vessel.
that the blood is confined to blood vessels and the blood is
recirculated. An earthworm has neither lungs nor gills
but uses its body's great surface area to absorb oxygen from the soil. The
oxygen is taken in by the dorsal blood vessel and travels to the five hearts
by the esophogus where it is pumped to the lower, ventral blood
vessel. The ventral blood vessel pumps the blood to all segments and organs in
need of oxygen. In each segment, there is a small blood vessel that sends the
blood from the ventral blood vessel back to the dorsal blood vessel.
The Leech
The leech's circulatory system does differ from the circulatory system such as
the worm. Compared to the earthworm, the leech only has two hearts. The
leech also has a closed circulatory system.
the worm. Compared to the earthworm, the leech only has two hearts. The
leech also has a closed circulatory system.
The Ragworm
The ragworm's circulatory system is sort of similar to the circulatory
system of the earthworm. However, they are still different, for the
earthworm live, most likely, in freshwater and has a few appendages.
While the ragworm has more bristles than the earthworm and mroe
appendages.
system of the earthworm. However, they are still different, for the
earthworm live, most likely, in freshwater and has a few appendages.
While the ragworm has more bristles than the earthworm and mroe
appendages.