Carbon contributes an electron, and Hydrogen contributes an electron. The sharing of a single electron pair is termed a single bond. When two pairs of electrons are shared, a double bond results, as in carbon dioxide.
Elements of nervous system involved in motor coordinationEdit. The red nucleus is mainly involved in motor coordination of the muscles of the shoulder and upper arm, but it has some control over the lower arm and hand as well.
Motor unit : consists of the motor nerve and all the muscle fibers it innervates. The motor unit (not the individual muscle cell) is the functional contractile unit. The nerve branches are dispersed throughout the muscle and not clustered in one area. Fine control : a motor neuron will only branch about 20X; allows for fine control and movement. Strength control : motor neuron will branch about 1000X; for strength and large movement .