1 Voltage can be thought of as the driving force (although it is not really a force.) behind current. 2  Things like batteries are voltage sources. 3  The voltage across the terminals of a battery tends to stay pretty constant. 4  When you connect a device across the battery terminals a current flows through the device.
Three types of muscles. The muscular system can be broken down into three types of muscles: skeletal, smooth and cardiac, according to the NIH. Skeletal muscles are the only voluntary muscle tissue in the human body and control every action that a person consciously performs. Most skeletal muscles are attached to two bones across a joint, so the muscle serves to move parts of those bones closer to each other, according to The Merck Manual.
Sometimes it's not the legs, chest or arms but the small, detailed areas of the body that are most appealing. The armpit area is one of those areas, and it actually contains three main muscles: the teres major, teres minor and latissimus dorsi.The teres major is right under your shoulder, covering the smaller teres minor muscle; the latissimus dorsi extends from your back to your chest, wrapping around the underarm area.ometimes it's not the legs, chest or arms but the small, detailed areas of the body that are most appealing. The armpit area is one of those areas, and it actually contains three main muscles: the teres major, teres minor and latissimus dorsi.