Capsaicin is the active chemical in red peppers, used as "pepper spray" and heating rub. It is a nerve irritant and could cause damage to the blood vessel walls and any muscles it passed through. The effect on the heart and lungs would depend on the amount (concentration) but it would definitely be unpleasant for the injectee.
Vaxigrip is generally injected Intra muscularly. But if injected to vein, then the Influenja Virus would travel via vein to your heart, and damage your heart.
what would happen if we remove the vein from the leaf
No, it is injected into a vein, not the testicles.
If injected directly into a vein in pure form, absolutely.
Medication is injected into either a vein or a muscle, depending on what it is and how fast it is to work. Into a vein (intravenous) is immediate as it goes directly into the bloodstream. Intra-muscular takes around 20 minutes.
It'll burn like hell.
About 1 Mg.
Renal venography, where a contrast material (dye) is injected into the renal vein before x rays are taken, is one of the best ways to detect renal vein thrombosis.
If you pop a vein in your bladder, there will be much bleeding.
There are a few different kinds. Sclerotherapy has liquid injected right into the vein to reduce the appearance. Laser treatments are used as well. Radio waves can be used and surgery is an option.
an x ray test that provides an image of the leg veins after a contrast dye is injected into a vein in the patient's foot.
This is called a shunt. One that occur between the Pulmonary artery and the Pulmonary vein, would be a left to right shunt. So what would happen? The blood from the Pulmonary vein (having the high pressure) would enter the Pulmonary artery. The results would be that the blood just goes back to the lung for another cycle with be deoxygenated.