yes
There is such a thing as the heart or even other areas developing collateral veins around the blockage
Yes. Veins are the paths in which your blood come back to your heart. Because gravity naturally acts against the flow in veins, they have multiple "one-way valve" mechanisms inside them.
Veins almost always carry deoxygenated blood from the periferal areas of the body to the heart. The veins going from our lungs to the heart, the pulmonary veins, however, carry oxygenated blood. Therefore the answer is: The pulmonary veins.
the veins supply the heart and the heart pumps the blood around the body
There are a few of them to list so click on 'related links' below and the link will take you to a picture of the heart and the veins and arteries.
Veins and arteries
Through both! The pulmonary veins carry oxygenated blood to the heart and then arteries carry it from the heart to the body as a whole. Veins return de-oxygenated blood to the heart.
For severe heart disease or extreme blockage of heart disease, surgery may be required if cardiac procedures are not enough. This typically includes what is called a coronary arterial bypass graft. A cardiothoracic surgeon, or heart surgeon, will have to open the chest and basically rewire the arteries in the chest with veins harvested from the leg or abdomen. This allows blood flow around blocked arteries and restoration of blood flow to damaged areas of the heart. This is typically seen when heart disease is so bad medical treatment is inadequate.
Arteries take oxygenated blood away from the heart and around the body. Veins take the deoxygenated blood back to the heart to be pumped into the lungs.
Other way around. Valves appear in veins to keep the blood flowing in one direction to the heart.
your heart pumps blood around the body via arteries, capillaries and veins.
The heart pumps it. When your heart beats it squeezes blood in the heart into the arteries and from the arteries to the veins and from the veins back into the heart.