anatomy

1. The key functions of muscle are motion of the body, movement of substances within the
body, body position stability, organ volume regulation, heat production, and energy formation.

2. The sequence of events resulting in skeletal muscle contraction are

a sheath of areolar connective tissue that wraps around individual skeletal muscle fibers

a sheath of dense irregular connective tissue that surrounds groups of individual muscle fibers

bundles of muscle fibers

the outermost connective tissue layer of skeletal muscle

dense irregular connective tissue that lines the body wall and limbs and hold muscles with similar functions together

a cord of dense regular connective tissue that attaches muscle to the periosteum of bone

areolar and adipose connective tissue that separates muscle from skin

connective tissue elements extended as a broad, flat lay

tubes of fibrous connective tissue containing a film of synovial fluid between the two layers of connective tissue; function to reduce friction

contractile elements of skeletal muscle

point of contact between a motor neuron and a muscle fiber

cells that give rise to new smooth muscle fibers

myoblasts that persist in mature skeletal muscle

plasma membrane of a muscle fiber

oxygen-binding protein found only in muscle fibers

calcium-ion-storing tubular system similar to smooth endoplasmic reticulum

the contracting unit of skeletal muscle

area in the contracting unit of a skeletal muscle where the thick filaments are located

the smooth muscle action that allows the fibers to maintain their contractile function even when stretched

a brief contraction of all the muscle fibers in a motor unit of a muscle in response
to a single action potential in its motor neuron

sustained contraction of a muscle

larger contractions resulting from stimuli arriving at different times

process of increasing the number of activated motor units

contraction in which the muscle shortens

inability of a muscle to maintain its strength of contraction or tension during prolonged activity

continual involuntary activation of a small number of skeletal muscle motor units produces this

contraction in which muscle tension is generated without shortening of the muscle

contraction in which a muscle lengthens

tension generated by actin and myosin resulting in contraction

tension generated by the connective tissue around the muscle fibers and not related to contraction