During the power stroke in skeletal muscle,
the myosin head releases the Pi.
During an action potential along the sarcolemma of a skeletal muscle,
influxes into the cell
to cause the depolarization.
In skeletal muscle, the ryanodine receptor (RyR) is a
gated channel for Ca++
The motor neuron synapses with the skeletal muscle cell at the neuromuscular junction.
In skeletal muscle, the myosin head
performs a “power stroke” to pull actin during the muscle
contraction, breaks down ATP into ADP and Pi, and binds to actin in a cross bridge formation.
The functional unit of a myofibril is called a
In skeletal muscle, the thin filament is composed of
actin, troponin, and tropomyosin.
are invaginations of the sarcolemma of a skeletal muscle cell that allow the action
potential to rapidly travel deep into the cell.
In a skeletal muscle cell at rest, the concentration of sodium is
higher on the outside of the cell
than the inside
Nicotinic receptors on the motor end plate are gated channels for
Na+ and K+.
In skeletal muscle, troponin and tropomyosin,
During the action potential of a contractile cell in the heart, influx of
The contractile cells in the heart have no resting potential.
During an action potential in the autorhythmic cells of the heart, Ca++ acts as a