Sliding filament theory can be best explained | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) : During muscle contraction,the laterally projecting heads (cross bridges) of the thick myosin myofilaments come in contact with the thin actin my

Vedclass · Accepted Answer

actin and myosin filaments do not shorten but rather slide pass each other

Vedclass · Answer

(A) : During muscle contraction,the laterally projecting heads (cross bridges) of the thick myosin myofilaments come in contact with the thin actin myofilaments and rotate on them.This pulls the thin myofilaments toward the middle of the sarcomere,past the thick myofilaments.The $Z$ lines come closer together and the sarcomere becomes shorter.Length of the $A$ band remains constant.Myofilaments (both actin and myosin) stay the same length.Free ends of actin myofilaments move closer to the centre of the sarcomere,bringing $Z$ lines closer together.$I$ bands shorten and $H$ zone narrows.$A$ similar action in all the sarcomeres results in shortening of the entire myofibril and thereby of the whole fibre and the whole muscle.

Sliding filament theory can be best explained as

Similar Questions

The dark bands in a myofibril are due to the presence of:

In the resting state,a subunit of troponin masks the active binding sites for .......... on the .......... filaments.

Sarcolemma is the covering of

Calcium is important in skeletal muscle contraction because it

$A$ sarcomere consists of

Vedclass Test Series

Exam Paper Generator

Online Exam Module