Which step of a muscle contraction can be described as the longest sarcomere, where actin and myosin are the least overlapped? step 1 step 2 step 3 step 4

Answer: Step 1

During step one no impulse has occurred yet. Thus, the muscle fiber is relaxed (at rest). The sarcomere is at its longest possible length due do the fact that myosin is not bound to the actin.

This step will end when the brain or spinal cord will send an impulse to the muscle. This will travel through the motor neuron and reach the neuromuscular junction. Here acetylcholine will be released, which in turn will trigger the impulse in the muscle.

satellites are frequently used to make observations of the orbit on earth

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.