Question

What type of muscle action generates tension in the muscle, but does not shorten it?

Answer 1

HELLO FRIEND HERE IS YOUR ANSWER,,,,,

Muscle actions are done through Muscular fibres containing the elements of actin and myosin which constantly relax while lengthening and shortening the muscles or remaining constant. The muscle action through muscle fibres which neither lengthens it nor shortens it or neither produce concentric or eccentric contractions,, just neutral,, are called as $\textbf{Isometric Contractions}$.

Isometric Contractions are producing or generating the force and the needed tensions between actin and myosin but they do not alter or change the total length of the muscle and hence barely show the concentric and eccentric Contractions. Isometric Contractions are basically the development or developed Muscular tension without any actual shortening and/or lengthening due to a "nonaccomplishment" of a job like putting against an immovable or not movable object. For a specific example these muscles are commonly found around the hands and the forearm and usually also between the palms and wrists too. To produce a Muscular Contraction there is a need to move joints to perform lengthening and shortening of that is absent and the muscles do not change length,, that becomes Isometric Contraction. Example of gripping around a immovable object like a weight or dum.bbell for force of gripping,, here the joints present around the hand do not move (unless we do Flexor, Extensor, Ad.ductor, Ab.ductor, etc. etc. etc. to produce Muscular tensions for the joints to move) this makes the actin filaments and myosin filaments in A Bands and Z Membrane respectively to generate sufficiently provided force to help the not moving object steady in one hand and not making it fall over, and hence generating tension "WITHOUT" any shortening or lengthening of muscles.

HOPE THIS HELPS AND GIVES YOU A DETAILED NOTE FOR MUSCULAR CONTRACTIONS!!!!!!