When a muscle is stimulated prior to full relaxation of a previous contraction and the second stimulus is added to the first contraction, this phenomenon is referred to as ________.
A. tetanus
B. twitch
C. fatigue
D. summation
Answer:D
When a muscle is stimulated prior to full relaxation of a previous contraction and the second stimulus is added to the first contraction, this phenomenon is referred to as ________.
A. tetanus B. twitch C. fatigue D. summation