PHYSIOLOGY
SKELETAL MUSCLE
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
In a contracting muscle, the ____ come closer together.
|
I band
|
|
A band
|
|
M line
|
|
Z disc
|
Explanation:
Detailed explanation-1: -Figure 6.7. 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.
Detailed explanation-2: -The movement of the actin filaments also pulls the Z lines closer together, thus shortening the sarcomere.
Detailed explanation-3: -The Z-band in vertebrate striated muscle crosslinks actin filaments of opposite polarity from adjoining sarcomeres and transmits tension along myofibrils during muscular contraction.
There is 1 question to complete.