Lack of relaxation between successive stimuli in sustained muscle contraction is known as:
Spasm
Fatigue
Tetanus
Tonus
As we learnt in
Disorders Of Muscular And Skeletal System -
Tetany
- wherein
Rapid spasms (wild contractions) in muscle due to low Ca++ in body fluid.
The correct answer is (3) tetanus, This disease is caused by bacteria Clostridium tetani. The bacteria release a poison tetanospasmin in the body resulting in the blockage of nerve signals from the spinal cord to the muscles thus causing muscle spasms and results in lockjaw.
Option 1)
Spasm
incorrect
Option 2)
Fatigue
incorrect
Option 3)
Tetanus
correct
Option 4)
Tonus
incorrect
Wild contraction- spasm
Slight contraction - tonus
Sustained contraction - tetany or tetanus