PHYSIOLOGY
SKELETAL MUSCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
The length of the resting sarcomere is
|
|
the same length as the muscle fiber.
|
|
|
the same length as a contracted sarcomere.
|
|
|
longer than the length of a contracted sarcomere.
|
|
|
shorter than the length of a contracted sarcomere.
|
Explanation:
Detailed explanation-1: -The resting sarcomere is about 2.2 mm long.
Detailed explanation-2: -When (a) a sarcomere (b) contracts, the Z lines move closer together and the I band gets smaller. The A band stays the same width and, at full contraction, the thin filaments overlap. When a sarcomere shortens, some regions shorten whereas others stay the same length.
Detailed explanation-3: -Because sarcomeres are joined end to end throughout an entire muscle fiber, their simultaneous contraction shortens the entire muscle. Each myosin filament has numerous heads, and each actin filament has numerous binding sites.
There is 1 question to complete.