Yes, the transducer cable can be cut. However, if the transducer came with a connector do not cut it off. The molded on connector is waterproof. You need to cut and splice the cable away from the connector using Airmar's splash-proof Junction Box.
Veins carry blood back to the heart, having picked up (via capillaries) carbon dioxide as a waste product from the respiration of individual cells. Veins also carry nutrients that were absorbed through the lining of the intestines and into the blood carried in tiny capillaries.
The arteries deliver the oxygen-rich blood to the capillaries, where the actual exchange of oxygen and carbon dioxide occurs. The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart. Veins carry the blood back to the heart.