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.
1 You need to be able to: 2  Explain the immediate and long term effects of exercise on the muscular system. 3  Describe potential injuries to the muscular system. 4  Understand how diet, rest and drugs can impact on the muscular system.5  Names of major muscle groups. Actions of major muscles (use textbook). 2  You need to be able to: 3  Explain the immediate and long term effects of exercise on the muscular system. 4  Describe potential injuries to the muscular system. 5  Understand how diet, rest and drugs can impact on the muscular system. 6  Names of major muscle groups.