Complete the sentences by choosing the correct word from each dropdown menu.In resting muscle fiber, a is normally 2.0 to 2.5 micrometers long.This is the optimum length for producing maximum when the muscle contracts.If a muscle fiber is overly contracted, the filaments but against the Z discs.Conversely, if the muscle fiber is overly stretched, there is not enough overlap between the thick and myofilaments.Therefore, if the thick and thin filaments do not overlap, very few are formed.

Check all that occur when a muscle is at its normal resting length before contracting.Check All That ApplyUpon contraction, the amount of active tension it can generate is less than normal.Upon contraction, the amount of active tension it can generate is less than normal.Upon contraction, the amount of active tension it can generate is maximal.Upon contraction, the amount of active tension it can generate is maximal.There is very little overlap between thick and thin filaments.There is very little overlap between thick and thin filaments.There is optimal overlap between thick and thin filaments.There is optimal overlap between thick and thin filaments.

The long, cylindrical, contractile portions of a muscle fiber, which are composed of even smaller myofilaments, are called .

The H-zone in the skeletal muscle fibre is due to:A extension of myosin filaments in the central portion of the A-band B the absence of myofibrils in the central portion of A-band C the central gap between myosin filaments in the A-band D the central gap between actin filaments extending through myosin filaments in the A-band

Check all of the terms below that will correctly complete this statement. During a muscle fiber contraction, the _________ decreases in size.  Check All That ApplyA bandA bandentire sarcomereentire sarcomereH zoneH zoneI bandI band

Which of the following statements is INCORRECT about "intrafusal muscle fibres" in any given muscle?Group of answer choicesthey make up a small proportion of the total mass of contractile muscle fibresthey are located within muscle spindlesthey are activated by alpha motor neuronsduring voluntary muscle activity they often contract in parallel with extrafusal muscle fibresthey extend the range of stretch-sensitivity of muscle spindles PreviousNext