Isometric And Isotonic Contractions
Isometric And Isotonic Contractions

Isometric contraction (A) sustains the position of a joint without producing movement. Concentric (B) and eccentric (C) contractions are isotonic contractions in which the muscle changes length: concentric contractions by shortening and eccentric contractions by actively controlled lengthening (relaxation). CONTRACTION OF MUSCLES Skeletal muscles function by contracting; they pull and never push. However, certain phenomena—such […]

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Structure Of Skeletal Muscle And Motor Units
Structure Of Skeletal Muscle And Motor Units

A. A motor unit consists of a single motor neuron and the muscle fibers innervated by it. B. Epimysium is the same as investing fascia. Actin (thin) and myosin (thick) filaments are contractile elements in the muscle fibers. Whereas the structural unit of a muscle is a skeletal striated muscle fiber, the functional unit of a muscle is a motor […]

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Hamstring Tendon Partially Torn From Tuberosity
Hamstring Tendon Partially Torn From Tuberosity

Muscle Soreness and “Pulled” Muscles Eccentric contractions that are either excessive or associated with a novel task are often the cause of delayed-onset muscle soreness. Thus, walking down many flights of stairs would actually result in more soreness, owing to the eccentric contractions, than walking up the same flights of stairs. The muscle stretching that […]

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Vascular Circuits Circulation – Cardiovascular System
Vascular Circuits Circulation – Cardiovascular System

A. Schematic illustration of the anatomic arrangement of the two muscular pumps (right and left heart) serving the pulmonary and systemic circulations. B. Schematic illustration of the body’s circulation, with the right and left heart depicted as two pumps in series. The pulmonary and systemic circulations are actually serial components of one continuous loop. C. […]

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