Type IIb muscle fibres; Intermediate sized motor units; Producing Moderate force

Type IIa muscle fibres; Small motor units; Producing Low force

Type I muscle fibres; Small motor units; Producing Low force

Type IIb muscle fibres; Large motor units; Producing High force

Type I muscle fibres; Intermediate sized motor units; Producing Low force

Large increase in passive tension but no change in active tension

A reduction in the optimal muscle length and therefore development of more muscle tension

Large summing of a number of successive individual motor neuronal APs, leading to peak muscle tension

Activation of only the small motor units, leading to asynchronous muscle fibre activation

Large summing of a number of successive individual muscle contractions and can lead to fatigue

Sarcomere length does not change

Ca++ is not required for contraction

Muscle twitches do not sum

The I bands shorten and the A bands stay the same length

The thick and thin filaments slide past each other

depends on the Ca²⁺ levels within the muscle fibres.

depends on the length of its tendons.

is slower the heavier the load.

is independent of the load.

A, B and C

the time it takes for the conduction of an action potential

the delay between the stimulus and the release of calcium ions from the sarcoplasmic reticulum

the time it takes for a muscle fiber to innervate surrounding muscle fibers

A and B

The lag phase

The contraction period

The latent period

The relaxation period

The action potential