Transcript Transport in Earthworm and Grasshopper

Aim: How does transport occur in the earthworm
and the grasshopper?
I. Transport in the Earthworm
A. Closed Circulatory System – blood is
contained in closed vessels. The blood does not
leave these vessels.
1. Its blood contains hemoglobin, a red
pigment which helps transport oxygen.
2. Its dissolved digestive end products are carried
in blood.
3. Blood vessels
a. Dorsal blood vessel – large blood vessel that
runs along the top of the earthworm. Brings
blood forward towards the aortic arches.
b. Ventral blood vessel – large blood vessel that
runs along the bottom of the earthworm. Brings
blood from the aortic arches to the rest of the
body.
c. Capillaries – microscopic blood vessels that bring
blood to and from the cells.
d. Aortic arches – 5 pairs of muscular pumps that
force the blood throughout the earthworm.
II. Transport in the Grasshopper
A. Open Circulatory System – the blood is not
always enclosed in blood vessels.
1. Blood only carries digestive end products,
NOT oxygen.
2. Tubular heart – a long, dorsal blood vessel
that helps pump the blood forward.
Grasshopper’s body movements also help
move blood.
3. Sinuses – open spaces in which blood collects
and soaks into tissues.