Dictionary » S » Sarcomere

Sarcomere

Definition

noun, plural: sarcomeres

A segment consisting of a highly organized assembly of filaments delimited by two Z lines; the contractile unit of a myofibril


Supplement

The sarcomere is regarded as the contractile unit of a myofibril since it contains the smallest functional structures and molecules essential for muscle contraction. Two important proteins namely actin and myosin form thin and thick filaments, respectively. These filaments are arranged in a way that they are partly overlapping and may slide past each other during contraction.


Word origin: Greek sarco (flesh) + -mere, from meros (part)

See also:


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Since each myofibrill is attached at either end of the.....

Since each myofibrill is attached at either end of the muscle fiber, when sarcomere shortens, the muscle fiber shortens. (T, F) isnt this false? my book says:" Since each myofibrill is attached at either end of the muscle fiber, when MYOFIBRILL shortens, ...

See entire post
by terestrife
Mon Apr 18, 2011 3:33 pm
 
Forum: Human Biology
Topic: Since each myofibrill is attached at either end of the.....
Replies: 1
Views: 5081

Sliding Filament Model

... a diagram depicts the sliding filament model as a process in which the myosin head cuases the thin filament (Actin) to move toward the centre of sarcomere (i.e. a one-way process). However, I am wondering how the actin would revert to its normal position after contracting. Thanks!

See entire post
by vertciel
Mon Sep 29, 2008 4:43 pm
 
Forum: Physiology
Topic: Sliding Filament Model
Replies: 4
Views: 6786

Re: Q's-Can someone please check my answers

Which of the following statements about muscle fibres are TRUE? 1-When a sarcomere contracts, the width of the A-band remains unchanged. 2-When a muscle contracts, the width of the sarcomeres shrink, and the length of the myofibrils decreases. 3-The length of ...

See entire post
by ComputerStud
Wed May 31, 2006 2:25 am
 
Forum: Physiology
Topic: Q's-Can someone please check my answers
Replies: 4
Views: 8482

Q's-Can someone please check my answers

can someone pls see ifi have these right? Which of the following statements about muscle fibres are TRUE? 1-When a sarcomere contracts, the width of the A-band remains unchanged. 2-When a muscle contracts, the width of the sarcomeres shrink, and the length of the myofibrils decreases. ...

See entire post
by biology_06er
Sun May 21, 2006 8:40 am
 
Forum: Physiology
Topic: Q's-Can someone please check my answers
Replies: 4
Views: 8482


This page was last modified 12:39, 20 September 2012. This page has been accessed 17,657 times. 
What links here | Related changes | Permanent link