Muscular Contraction

Contraction of muscles is due to the movement of microfilaments.

• True

• False

Skeletal Muscles:

• attached to bones

• very long

• multinucleated

• striated

• voluntary and non-rhythmic

Cardiac Muscle:

• striated

• intercalated discs

• uninucleate

• involuntary and rhythmic

• found in the spleen

Smooth Muscle:

• found in walls of hollow organs

• no striations

• involuntary and some rhythmic contraction

• uninucleate

• slow contraction

encloses a single muscle fiber

• endomysium

• perimysium

• epimysium

• fascia

wraps around a fascicle (bundle) of muscle fibers

• endomysium

• perimysium

• epimysium

• fascia

covers the entire skeletal muscle

• endomysium

• perimysium

• epimysium

• fascia

on the outside of the epimysium

• endomysium

• perimysium

• epimysium

• fascia

Tendons:

• cord-like structures

• made up of collagen fibers

• often cross a joint due to toughness and small size

• epimysium blends into it

Aponeuroses:

• sheet-like structure

• attaches muscles indirectly to bones, cartilages, or connective tissues