Muscle

The function of muscle?

Contract and provide movement

Motor End Plate

Area where nerve innervates the muscle

Three types of muscle?

Smooth
Skeletal
Cardiac

Smooth Muscle

Long/Slow movement
One nucleus centrally located
Autonomic nervous system
digestive tract, blood vessels, respiratory system

Skeletal Muscle

Stripped nuclei, multiple nuclei
voluntary control, striated, rapid strong short movement

Cardiac Muscle

Involuntary control, striated, branching fibers, 1 nucleus * In the heart
Characteristics of both Smooth and Skeletal muscle

What 2 muscles types are involuntary?

Smooth
Cardiac

What two types of muscle types are striated?

Skeletal
Cardiac

intercalated discs

Junction between one cell to another, controlled by the autonomic nervous system

Organization of skeletal muscle

1 support the muscle cells
2 transmit contractions
3 attachment site for ligaments and tendons
4 Provide nutrients for the cells

3 types of connective tissues coverings?

endomysium
perimysium
epimysium

Endomysium

aka plasma membrane
covering one cell *seperates cells

sarcolemma

connective tissue that covers each individual muscle fiber

perimysium

around each individual bundle covers groups of muscle fibers

epimysium

out covering around bundles of bundles- covers bundles of groups of muscle fibers

A myofiber is made up of what?

Myofibrils

Myofibrils are made up of what?

myofilaments

Myofibrils are composed of regularly arranged protein filaments called?

Actin and Myosin

Actin filaments are attached to?

Z-Band

The length of this band does not change during contraction or relaxation?

A Band

The length of the I Band gets Bigger/Smaller during contractions?

Smaller

This zone is reduced or smaller during contractions?

H Zone

The section of a myofibril between 2 Z bands is called

Sarcomere

Tranverse tubule

invagination of the sarcolemma opens to the connective tissue .
Coordinates actions of myofibrils