Download Comparative Anatomy

Comparative Anatomy
CIRCULATORY SYSTEMS
Protists
 Materials
diffuse into the cell and are distributed
within by cyclosis.
Hydra
The Hydra has no
specialized transport
system.
- Since the hydra is only
two cells thick all of the
cells are in direct contact
with the surrounding
environment.
- Items follow diffusion
Grasshopper
The grasshopper has:
 An
internal OPEN CIRCULATORY SYSTEM: No
network of vessels
A
Tubular heart which pumps blood into the
AORTA: A large muscular blood vessel which
squirts blood into the…
 SINUSES:
large cavities where blood bathes cells.
Blood re-enters the heart through a series of ostia
(openings).
Grasshopper
The blood of a grasshopper does NOT contain
hemoglobin! So it can’t carry oxygen. It carries
food and wastes.
The grasshopper is basically hollow inside, with blood
squirting everywhere, like a lemonade machine
Earthworm
Since the worm has many cells NOT in contact with the
external environment, it needs a circulatory system to
distribute materials throughout its body. It Possesses a
CLOSED circulatory system: It has blood vessels to contain
the blood.
 Contains red pigment called hemoglobin.
 It carries oxygen.
 Moved through the vessels by the pumping of 5 pairs of
aortic arches (hearts).
 The exchange of materials takes place between blood
and body cells through the walls of the smallest blood
vessels called capillaries.
Earthworm