An era is a commonly used word for a long period of time. When used in science, for example geology, an era denotes a clearly defined period of time of arbitrary but well-defined length, such as for example the Mesozoic Era from 252 Maâ66 Ma, delimited by a start event and an end event.
As you increase voltage to the muscle describe how it responds to the increased stimulus. As the voltage was increased from threshold to maximum voltage, there was a greater force in the muscle contraction. Once the maximum voltage (2500 mv) was reached, even if there was an increase in voltage, the force of the muscle contraction remained the same.
What are the steps in muscle contraction. 1. Efferent motor cortex axons synapse on the spinal cord and generate an action potential in the Î±-motor neuron. 2. The action potential travels to the axon terminal, releasing acetylcholine into the synaptic cleft.3.Acetylcholine binds a receptor on the skeletal muscle cell and generates an action potential, increasing Ca++ release from the sarcoplasmic reticulum.4. Ca++ initiates contraction, resulting in shortening of the muscle cell and, consequently, movement.he action potential travels to the axon terminal, releasing acetylcholine into the synaptic cleft. 3. Acetylcholine binds a receptor on the skeletal muscle cell and generates an action potential, increasing Ca++ release from the sarcoplasmic reticulum.