Chapter 1: Structure and Function of the Muscular, Nervous, and Skeletal Systems

Each skeletal muscle is surrounded by a later of connective tissue called

bundles of muscle fibers

connective tissue forming fascicles

connective tissue surrounding individual muscle fibers

These help transmit the force of muscle action to the bone

plasma membrane of a muscle cell

electrical impulses to the MF

cytoplasm of the MF

organelle that stores aclcium and regulates the muscle action process by altering the inracellular calcium concentration

channels that form openings in the sacrolemma, and conduct AP

column of protein structures that run parallel to the length of the muscle fiber

each myofibril is a budle of these

two primary myofilaments

this protein acts to maintain the position of the myosin filament relative to actin

two regulatory proteins associated with actin

spans the length of 7 G-actin proteins along the length of the actin filament

each end of the tropomyosin filament is attached to this

this protein acts to ensure the correct length of the actin filaments

basic contractile unit of the muscle

The sarcomere extends from here to here

This is determined by the width of the myosin filament

Actin filaments are anchored here

the area of the a band that contains myosin by not actin

this middle of the H-zone is a dark line called the