Structure of vertebrate skeletal muscles, Biology

Structure of Vertebrate Skeletal Muscles

Vertebrate skeletal muscles are composed of a large number of long, cylindrical and multinucleated cells, called muscle fibres arranged parallel to each other. The fibres contain longitudinally arranged elements called myofilaments. The myofilaments are organised into myofibrils. The fibres measure between 0.1 to 0.01 mm in diameter and several centimetres long. The myofibrils have characteristic cross striations called Z-lines, which are repeated at regular intervals. The region between two Z-lines is called a sarcomere, which is a functional unit of a myofibril. Thus a myofibril consists of longitudinally repeating sarcomeres. The Z-lines of adjacent myofibrils are lined up with each other, forming alternating A-bands and I-bands. There is a lighter region in the middle of the A-band called the H-Zone. These bands appear continuous for all the fibrils of a muscle fibre and it is this alignment of banding that gives the fibre its striated appearance.

304_Structure of Vertebrate Skeletal Muscles.png

Figure:  Schematic diagram of striated (skeletal) muscle and its components

Posted Date: 1/16/2013 4:27:26 AM | Location : United States







Related Discussions:- Structure of vertebrate skeletal muscles, Assignment Help, Ask Question on Structure of vertebrate skeletal muscles, Get Answer, Expert's Help, Structure of vertebrate skeletal muscles Discussions

Write discussion on Structure of vertebrate skeletal muscles
Your posts are moderated
Related Questions
Explain about Stacking faults Stacking faults happen in a number of crystal structures, but the common example is in close-packed structures.  Face-centered cubic (fcc) struct

Q. Do echinoderms have circulatory and respiratory systems? In echinoderms there are not well- defined respiratory with the exception of the holothurian group and circulatory s

In the previous sub-section we discussed the possible ways by which variabiliti can, be generated. We shall now examine one instance that illustrates the consequence of variability

Genic Type-Genetic basis of Sex Determination In some organisms, certain indepe~ident genes located on different chromosomes are responsible for sex determination. Most species

Enumerate the Number of converging developments These include: 1) A better definition of the unique developmental concepts that are applicable to infants and young children,

Define the Miscellaneous Applications of Sugar? Sugars are used in 1. Custards, 2. puddings, 3. pie fillings and meringues Depending on the sugar to perform vital c

SIMPL E EPITHELIA (UNILAYERED EPITHELIA) - 1 .      SIMPLE SQUAMOUS EPITHELIUM (PAVEMENT EPITHELIUM) - It is composed of large flat cells whose edges fit closely toge

Which are the glands present in the epidermis of mammals, birds and reptiles? In the epidermis of birds and reptiles there are almost no glands. In mammals there are sweat glan

Explain the False indications of Endodontic Surgery a) Large periapical lesion that could not be eliminated with non-surgical approach. b) Incomplete root formation "open ap

Natural Colors Used In Foods Natural colourants produced for use in an analogous way to the coal-tar dyes are crude extracts of pigments, which are basically unstable. The appa