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Skeletal Muscle Org.

Structual organization of Skeletal Muscle

QuestionAnswer
What is the term for a single muscle cell? Muscle fiber
The membrane surrounding the muscle fiber is...? The sarcolemma
Specialized cytoplasm in the muscle is ...? sarcoplasm
What are the threadlike units called made of actin and myosin? Myofibrils
The functional unit of muscular contraction is the _____________? sarcomere
These discs border the sarcomere on each end. Z lines
These are projections on the myosin that physically link with the actin. cross-bridges
What network of channels contains Ca++ to help activate muscle contraction? sarcoplasmic reticulum
These channels run perpendicular to the sarcomeres and carry the Ca++ that are released by the SR transverse tubules
What thin connective membrane surrounds the sarcolemma? endomysium
This connective tissue surrounds the whole muscle and is continuous with the tendon. epimysium
This connective tissue bundles muscle fibers into fascicles. perimysium
This zone disappears when actin is moved towards the center of the sarcomere during a contraction. H zone
This area of the sarcomere contains thick, rough myosin filaments, overlapped by thin, smooth actin filaments. A band/Anisotropic band
This area of the sarcomere contains contains only thin actin filaments I band/Isotropic band
This bisects the sarcomere into two equal portions M line
Created by: gwacker