The state of a continuously mild or partial contraction of a muscle is denoted as

Options

A. tonus
B. tetanus
C. a twitch
D. a reflex contraction

Answer

A

Explanation

Tonus refers to muscular activity in which a shortened condition is maintained for a prolonged period. Visceral muscle is the outstanding example. The word tonus can be applied to any sustained process which is the result of probable regularly repeated excitation.