Concentric: Used to describe the part of a repetition in which the muscle group works against gravity, usually contracting the muscle, such as lifting a weight.

 

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Concentric: Used to describe the part of a repetition in which the muscle group works against gravity, usually contracting the muscle, such as lifting a weight.

Concentric Contraction: An isotonic muscle contraction, where a muscle contracts or shortens.

Concentric Muscle Action: When a muscle shortens while contracting against resistance.

Oolite: A small sphere of calcium carbonate no more than a few millimeters in diameter and with a concentric internal structure . These spheres are thought to have formed by inorganic precipitation . . . View Full Definition

Mantle: In mollusks, a membranous or muscular structure that surrounds the visceral mass and secretes a shell if one is present.

Oolitic: A limestone texture that is characterized by spherical grains of calcium carbonate with a concentric internal structure. These grains are thought to form by inorganic precipitation of calciu . . . View Full Definition

Core: The abdomen, obliques, lower back, butt, and so on, that form the midsection. Many forms of exercise focus on strengthening the body's core.

Range Markers: Equally spaced concentric rings of light on the ppi which permit the radar observer to determine the range to a contact in accordance with the range setting or the range of the outer rings. . . . View Full Definition

Stromatolite: A sedimentological and biological fossil representinmg colonies of bacteria altenating with layers of sediments. Becoming more common during the Proterozoic, stromatolites persist today in m . . . View Full Definition

Racon: Radar beacon which, when triggered by a ship's radar signal, transmits a reply which provides the range and bearing to the beacon on the ppi display of the ship. The reply may be coded for i . . . View Full Definition