Question

Integumentary system Which statement explains the sarcomere appearance change during a muscle contraction

a.The light a bands remain at a constant length
b.The I bands lengthen
c.The I bands will only consist of thin filament
d.The h zone shortens as actin filaments slide towards the m-line

Answer 1

The correct answer is letter "A": The light A bands remain at a constant length.

Step-by-step explanation:

In front of muscle contraction, the A-bands do not change their length, while the I-bands and the H-zone shorten. It provides a closer connection between the Z axes. The protein -tropomyosin- protects the actin molecules in the muscle cell's myosin binding sites.