Ischemia is the medical term for what happens when your heart muscle doesn't get enough oxygen. Ischemia usually happens because of a shortage of blood and oxygen to the heart muscle.It is usually caused by a narrowing or blockage of one or more of the coronary arteries (which supply blood to the heart muscle).schemia is the medical term for what happens when your heart muscle doesn't get enough oxygen. Ischemia usually happens because of a shortage of blood and oxygen to the heart muscle.
The slug is a unit of mass associated with Imperial units and United States customary units. It is a mass that accelerates by 1 ft/s 2 when a force of one pound (lbF) is exerted on it.
Differences in Shell. The long body and tentacles of slug is very similar to those of a snail, but the main physical difference between the two species is the shell.The snail uses its shell as an external attachment to protect and cover its body.The slug, however, has a small inner shell, which lies underneath the skin. Slugs and snails both breathe through an air hole on their mantle, called a pneumostome. On snails, the pneumostome lies is juxtaposed next to the shell.he snail uses its shell as an external attachment to protect and cover its body. The slug, however, has a small inner shell, which lies underneath the skin. Slugs and snails both breathe through an air hole on their mantle, called a pneumostome. On snails, the pneumostome lies is juxtaposed next to the shell.