1. Transport in the Earthworm
and Grasshopper

2. 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.

4. 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.

5. 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.

7. 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.

8. 3. Sinuses – open spaces in which blood collects and soaks into tissues.