Muscular+system+EP

Muscular System (1) What are the three types of muscles in the human body? (Describe and include pictures) (2) List and discuss the functions of muscles. (3) Give an example that illustrates how muscles work in antagonistic pairs. (pictures good) (4) Describe the microscopic anatomy of muscle fiber and explain the sliding filament model of muscle contraction. (long answer) (5) Describe the structure and function of the neuromuscular junction. (6) Describe the events as myosin pulls actin toward the center of the sarcomere. (7) Contrast a muscle twitch with summation and tetanus. (8) What is muscle tone, and how is it maintained?
 * Smooth muscles- spindle-shaped cells with a single nucleus. cells are in parallel lines that form sheets.
 * Cardiac muscle- forms the heart wall. the fibers are able to interlock.
 * skeletal muscle- are attched to the skeleton. fibers are tubular, multinucleated, and straited.
 * Support the body
 * muscles makes bones move
 * muscles help maintain a constant body temperature
 * muscles contraction assists movement in cardiovascular and lymphatic vessels.
 * When you move your bicep it works with the tendons on the elbow that also moves your forearm.
 * The branch of a nerve fiber in an axon termanl meets. the axon termminal is seperated form the muscle fiber. nerve impulses travel down the fiber to discharge the acetylcholine which diffuses the synaptic cleft and blinds the ACh receptors.
 * a muscle twitch is when the muscle generates tension and summation and tetanus is a disease the allows the muscles to lock up.
 * is a continuous and passive partial contraction of the muscle. it is maintained by the nerve impulses.