Unit 4 Bio III Exam (Muscles)

A sarcomere is best desribed as

• A part of the sarcoplasmic Reticulum

• A group of fascicles

• A group of muscle fibers

• A unit within a muscle fiber

Myofibrils are composed primarily of

• Actin and myosin

• perimysium and endomysium

• troponin and tropomyosin

• Fascia and tendons

The word segment that means "flesh"

• Sarco-

• Epi-

• -tonic

• Myo-

• Reticul-

A tendon is _______. whereas an aponeurosis is _______

• Cordlike and connects bones to bones; a broad sheet of dense connective tissue that connects muscles to muscles

• A broad sheet of dense connective tissue that connects muscles to muscles; cordlike and connects bones to bones

• Cordlike and connects muscles to bones; a broad sheet of dense connective tissue that connects muscles to muscles

• A broad sheet of dense connective tissue that connects bones to bones; cordlike and connects muscles to muscles

Connective tissue layer that surrounds whole muscle

• Perimysium

• Myofibril

• Motor-end-plate

• Fascia

Cardiac Muscle

• Is multinucleated

• Excites itself

• Contains only a few mitochondria

• Partially lines the intestines

Muscle that is involuntary, non-striated, and singly nucleated

• Skeletal

• Cardiac

• Smooth

• Rough

• Esoteric

Muscle that is voluntary, striated, and multinucleated:

• Skeletal

• Cardiac

• Smooth

• Rough

• Esoteric

Muscle that is involuntary, striated, and singly nucleated

• Skeletal

• Cardiac

• Smooth

• Rough

• Esoteric

Definition of a motor unit

• One T-tubule and all the myofibrils it controls

• One myofibril and all the T-tubules it controls

• One muscle fiber and all the motor neurons it controls

• One motor neuron and all the muscle fibers it controls