Question

If a muscle fiber is stimulated repeatedly, but not allowed to completely relax between contractions, it will exhibit stronger tension as the stimulation becomes more frequent. This is an example of

A. treppe

B. asynchronous motor unit recruitment

C. multiple wave summation

D. tetany

At rest, a skeletal muscle fiber has a sarcolemma that is

A. depolarized

B. polarized with a positive charge on the outside and negative charge on the inside

C. polarized with a negative charge outside and positive charge inside

D. permeable to ions

Answer 1

1st question- multiple wave summation

In multiple wave summation, the addition of second wave before the first wave is completed, will result in increase in amplitude of wave. Due to this Reason, greater tension is generated because of summation.

Tetany is a condition in which the m muscle remain in the state of contraction. There is no relaxation phase.

In treppe, the contraction of muscles gradually increases when same stimulus is applied for long duration.

Asynchronous motor unit recruitment means activation of multiple motor unit, to increase force of contraction, but in asynchronous manner.

Question 2-polarized with negative charge inside and positive outside.

explanation- the sarcolemma is the plasma membrane of the sarcoplasmic reticulum. At rest, the membrane is polarizes because positive ions like sodium and potassium are outside while chloride ions are inside the membrane. When the membrane is depolarized, the polarity is reversed and positive ions rush in.