The sliding filament theory explains how these cross-bridges are formed and the subsequent contraction of muscle. The Sliding Filament Theory For a contraction to occur there must first be a stimulation of the muscle in the form of an impulse (action potential) from a motor neuron (nerve that connects to muscle).
A plant scientist is a biologist who focuses on various types of plants, usually those grown as crops for food, fiber, and other purposes. This work can involve field and lab work on a variety of topics, from improving yields to developing more nutritious food plants for the purpose of fighting hunger in underdeveloped nations.
A forensic scientist, also called a crime scene investigator or a forensic science technician, may specialize in crime scene investigation which entails the collection and cataloging of evidence, or laboratory analysis which involves using scientific methods to identify and classify evidence. Employment Facts.efore one can work independently as a forensic scientist, he or she must receive extensive on-the-job training. This takes place through an apprenticeship with an experienced colleague. The novice technician is trained to properly collect and document evidence.