Muscle 1st ppt

Tendon

dense connective tissue that attaches a muscle to a bone

Deep Fascia

outer muscle covering

Epimysium

sheet of connective tissue that directly surrounds the muscle

Epimysium

holds muscle unit together

Perimysium

surrounds bundles of muscle fibers (fascicles)

endomysium

Connective tissue surrounding a muscle fiber

electrical excitability, contractibility, extensibility, elasticity

properties of the muscular system

electrical excitability

production of action potentials

contractability

generation of tension

extensibility

ability to stretch

elasticity

ability to go back to original form

muscle fibers

are called myocytes

subcutaneous layer (hypodermis)

separates the skin from the muscle

fascia

dense sheet of irregular connective tissue

surrounds the body cavities

Aponeurosis

extended broad band of connective tissue

sarcolemma

plasma membrane of a muscle fiber

Myofibril

very long chains of sarcomere

sarcomere

contractile units that contain thin and thick filaments

..

muscle fiber align in parallel arrangements to look like strong strands of fibers

Transverse tubule

these are invaginations of the sarcolemma that go deep into the muscle fiber

Sarcoplasmic retiuculum

stores calcium ions

Terminal cisternae

store large amounts of calcium then quickly releases it

Triad

a structural grouping consisting one t tubule

myofibrils

made of protein myofilaments that forms sarcomeres

actin and myosin

myofilaments is composed of what

Sarcoplasm

called the cytoplasm of the muscle

myoglobin

binds o2

glycogen

polymer of glucose

actin

thin filaments

myosin

thick filaments

Z disc

separates sarcomeres

I band

light band, thin filaments

A band

dark band, thick filaments

H zone

thick filaments only

M line

middle of h zone, holds thick filaments together

contractile proteins

proteins that generate force during muscle contractions

regulatory proteins

proteins that help switch muscle contraction process on and off

isotonic contractions

the length of the muscle changes

lifting or working

isometric contractions

length of the muscle does not change

holding a position