The collagenous fibers that line and bind fascicles
Collagenous fiber lining that encapsulates an entire muscle, and is connected to the deep faciae
The connective tissue that surrounds and protects each individual muscle fiber within the fascicle.
a broad sheet of connective tissue that muscles bind to. may connect to multiple bones.
Muscle cells are also considered
cylindrical structures that fill the sarcoplasm of each muscle cell.
functional units of myofilaments that contract
Point where the motor neuron interacts with muscle fibers by releases acetylcholine vesicles into the synaptic cleft.
What happens at neuromuscular junction.
Electrical impulse travels from the neuron to the muscle cell triggering the release of calcium ions.
Calcium ions trigger the release of acetylcholine which bind to receptor sites.
acetylcholine cause the release of sodium ions causing contraction
Zone of muscle cell with no thick filaments
Serves as the boundary between two thin filaments
zone in a resting cell that contains thick filaments but no thin filaments
Joins each of the thick filaments by their midpoint
Dense region of the sarcomere that contains the thick filaments
how do muscles move
When actin is exposed to calcium ions, the troponin is moved away exposing the active site for the myosin heads to bond to
When the active site on the actin is open, the myosin head becomes attracted to it, and it binds dropping the ADP. The myosin recocks when another ATP molecule binds, and it recocks allowing it to powerstroke again to the next active site
a graph of tension development in muscle fibers
All the muscle fibers controlled by a single motor neuron
resting tension in a skeletal muscle
tension rises exceeding the load, and the muscle length changes
Muscle contracts not exceeding the load, muscle does not change in length