Video shows what sporophyte means. A plant (or the diploid phase in its life cycle) which produces spores by meiosis in order to produce gametophytes.. Sporo...
Concentric contraction involves a shortening of the muscles under loading and is used to accelerate the body or move an object, as when you suddenly move in the opposite direction to hit the baseball.
Isotonic movements are either concentric (working muscle shortens) or eccentric (working muscle lengthens). concentric: (Of a motion), in the direction of contraction of a muscle. (E.g., extension of the lower arm via the elbow joint while contracting the triceps and other elbow extensor muscles. eccentric: Against or in the opposite direction of contraction of a muscle. (E.g., flexion of the lower arm (bending of the elbow joint) by an external force while contracting the triceps and other elbow extensor muscles to control that movement.