Muscle Contraction

What is an action potential?

Electrical impulse

One motor neuron and all of the muscle cells it controls is called…

Motor Unit

Vesicles in the synaptic terminal of a motor neuron contain _______.

Acetylcholine

Acetylcholine crosses the synaptic cleft and binds to the receptors on the…

Sarcolemma or motor end plate

Action potentials travel along the sarcolemma and reach the interior of the cell through…

Transverse or T-tubules

Calcium ions are stored in the _____ ______.

Sarcoplasmic Reticulum

Muscle cells or fibers are made up of _____.

Myofibrils

The membrane covering the muscle cell or fiber is called ______.

Sarcolemma

Myofibrils are made up of repeating sub-units called ______.

Sarcomeres

Thick filaments are also called…

Myosin Filaments

Thin filaments are also called…

Actin Filaments

Myofibrils bundled together form…

Muscle cell or fiber

Muscle fascicles bundled together form…

Skeletal Muscles

To initiate the sliding of filaments, ______ is released into the sarcoplasm.

Calcium Ions

What is the function of skeletal muscle?

Produce movement, maintain posture, maintain body temperature