the width of the I band in the sarcomeres is at a minimum.

the thin filaments from either end of the sarcomere are overlapping each other.

a fully fused tetanic contraction produces maximum force.

summation is no longer effective and twitch contractions are sufficient to give maximum force.

the fact that the myofilaments are arranged in a highly regular array.

the regularly spaced terminal cisternae of the sarcoplasmic reticulum.

the light reflecting properties of the connective tissue surrounding the muscle fibre.

the regular arrangement of the T-tubules (transverse tubules) running transversely through the muscle fibre.

attachment of the myosin heads to actin activates their ATPase activity.

tropomyosin alters its position on the thin filament.

Ca²⁺ binds to tropomyosin causing it to come off the thin filament.

 troponin detaches from the myosin heads to allow them to bind to actin.

G

D

A

C

E

B

F

are more sensitive to a change in touch than to sustained touch

are particularly sensitive to vibratory stimuli on the skin

lack capsules on the end of the receptor nearest the epidermis

are particularly sensitive to indentations in the skin