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 pulmonary circuit carries blood to the lungs to be oxygenated and then back to the heart. In the lungs, carbon dioxide is removed from the blood, and oxygen taken up by the haemoglobin in the red blood cells. The systemic circuit carries blood around the body to deliver the oxygen and returns de-oxygenated blood to the heart. Blood also carries nutrients and waste.