In the same way when you puncture a hole in a garden hose, some water will flow out but some will stay in the hose. The heart continues pumping blood, and the cut in the blood vessel will eventually be plugged by your body's automatic clotting mechanism.
Blood flow in the center of a large vessel is faster because the walls of the blood vessel may have a buildup of cholesterol on them.
The longer the vessel is the more friction it applies on the passing blood, the less the blood flow is.
artery
Contractions and relaxation of heart chambers make the blood flow inside the tubes or blood vessel.
The relationship between blood flow through a vessel and the radius of the vessel can be expressed as BF=1/pi r4 (where pi is equal to 3.14.....). So a change in the radius of a vessel has a large effect on the blood flow through the vessel.
cappillaries
cappillaries
Branchial
Capillaries
A thrombus may, or may not, block the flow of blood in a vessel.
increase in the diameter of blood vessel. it increases the blood flow
blood vessel holes, blood vessel wall tears, or reduced blood flow to the heart