PHYSIOLOGY
SKELETAL MUSCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
True or False:Muscle fiber contraction is “all of none".
|
|
True
|
|
|
False
|
|
|
Either A or B
|
|
|
None of the above
|
Explanation:
Detailed explanation-1: -Individual muscle fibers contract in an all or nothing phenomenon, but whole can contract in a graded phenomenon. This is achieved by altering the number of motor units activated in the whole muscle.
Detailed explanation-2: -So, the correct answer is ‘A-Band remains constant’.
Detailed explanation-3: -Answer and Explanation: The statement that is false is d. sarcomeres increase in length during contraction. Sarcomeres are the smallest contractile units of muscles and they actually shorten, which causes muscle contraction.
There is 1 question to complete.