Skeletal Muscle Structure & Contraction WSH Review

Endomysium

-Delicate connective tissue surrounding each muscle fiber

Permysium

-Connective tissue that surrounds bundles of muscle fibers

Epimysium

-Outer connective tissue covering the entire muscle

Myofibrils

Tiny structures inside muscle fibers that cause contraction

Actin

-Thin Protein filament that provides a track for movement

Myosin

-Thick protein filament with heads that pull during contraction

Neuromuscular Junction

Communication site between a motor neuron & a muscle fiber

Acetylcholine

-Chemical messenger released from a motor neuron

What is a skeletal muscle fiber?

Single Muscle fiber(Responsible for contraction)

Myofibril’s role in muscle contraction..

-Generates force by shortening through the sliding of action & myosin

Function of the “fascia”

Separates Muscles

ACH’s Significance?

Carries nerve signal to muscle fiber

Ex: An athlete has swelling & pressure in the anterior compartment of the lower leg, what condition may be present?

Compartment Syndrome

Danger of Compartment Syndrome?

-May lead to tissue damage, less blood flow, etc

Myosin Pulls..

Actin Inward