Question

a weight - lifter strains to lift a heavy weight and there is no movement of the persons arms holding on to the weight. this type of contraction is called a(n) ______ contraction.
concentric
isotonic
treppe
isometric
tetanus

Explanation:

Isometric contractions occur when muscle tension is generated without a change in muscle length, which is the case when a weight - lifter strains to lift a weight but there is no arm movement. Concentric contractions involve muscle shortening while generating force. Isotonic contractions are those where muscle length changes during contraction. Treppe is the staircase - like increase in muscle contraction strength. Tetanus is a sustained, maximal contraction due to high - frequency stimulation.

Answer:

D. isometric