Muscular System Quiz

Types of muscles and characteristics

o Cardiac

Tissue of the heart

Involuntarily controlled

Striated

Has a single nucleus in each cell

Found in the walls of the heart

Contains branching cylindrical cells

Has intercalated discs

Changes the internal volume of the heart as it contracts

o Skeletal

Found attached to bones

Voluntarily controlled

Striated

Has several nuclei per cell

Contains long, non-branching cylindrical cells

Concerned with locomotion of the body as a whole

o Smooth

Found in the walls of the stomach, uterus, and arteries

Involuntarily controlled

Has a single nucleus in each cell

Contains spindle-shaped cells

Changes internal volume of an organ as it contracts

Anatomy of a microscopic muscle cell (p. 91)o Perimysium

Connective tissue surrounding a fascicle, or bundle, of muscle fiberso Epimysium

Connective tissue that covers the entire muscle cello Endomysium

Thin connective muscle that surrounds a single muscle fibero Fascicle

Bundle of muscle cellso Fiber

Muscle cello Myofilament

Actin or myosin-containing structureo Myofibril

A long filamentous organelle found within muscle cells that has a banded appearanceo Sarcolemma

Plasma membrane of the muscleo Sacromere

Contractile unit of muscleo Tendon

Cordlike extension of connective tissue beyond the muscle, serving to attach it to the bone Anterior muscles

Posterior muscles

What is the major function of a muscleo To provide movement for the body

It contracts and shortens Heat Movement Posture