Structure of Skeletal Muscle

Structure of Skeletal Muscle - Along the length of the...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Structure of Skeletal Muscle A muscle fiber (cell) has special  terminology and distinguishing  characteristics: class="bullet"> •   The  sarcolemma,  or plasma  membrane of the muscle cell, is highly  invaginated by transverse tubules (T  tubes) that permeate the cell. •   The sarcoplasm, or cytoplasm of the  muscle cell, contains calcium-storing  sarcoplasmic reticulum, the specialized  endoplasmic reticulum of a muscle cell.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
•   Striated muscle cells are  multinucleated. The nuclei lie along the  periphery of the cell, forming swellings  visible through the sarcolemma. •   Nearly the entire volume of the cell  is filled with numerous long myofibrils.  Myofibrils consist of two types of  filaments, shown in Figure 1: Thin filaments consist of two  strands of the globular protein  actin arranged in a double helix. 
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Along the length of the helix are troponin and tropomyosin molecules that cover special binding sites on the actin. • Thick filaments consist of groups of the filamentous protein myosin. Each myosin filament forms a protruding head at one end. An array of myosin filaments possesses protruding heads at numerous positions at both ends. Figure 1. Two types of filaments. Within a myofibril, actin and myosin filaments are parallel and arranged side by side. The overlapping filaments produce a repeating pattern that gives skeletal muscle its striated appearance. Each repeating unit of the pattern, called a sarcomere, is separated by a border, or Z disc (Z line), to which the actin filaments are attached. The myosin filaments, with their protruding heads, float between the actin, unattached to the Z disc....
View Full Document

This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

Page1 / 4

Structure of Skeletal Muscle - Along the length of the...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online