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.
Some Types of Scientists. 1  An agronomist specializes in soil and crops. 2  An astronomer studies stars, planets and galaxies. 3  A botanist specializes in plants. 4  A cytologist specializes in the study of cells. 5  An epidemiologist studies the spread of diseases. 6  An ethologist studies animal behavior. An agronomist specializes in soil and crops. 2  An astronomer studies stars, planets and galaxies. 3  A botanist specializes in plants. 4  A cytologist specializes in the study of cells. 5  An epidemiologist studies the spread of diseases.