Q3 Q#4 Muscular System

Functions of muscles include

• pumping blood.

• generating electrical impulses.

• storage of minerals.

• cushioning tissues from blunt force.

The outermost layer of connective tissue surrounding a skeletal muscle is the

• epimysium

• perimysium

• endomysium

• sarcomysium

Myofibrils are composed primarily of

• troponin and tropomyosin.

• perimysium and endomysium.

• actin and myosin.

• fascia and tendons.

The striated appearance of skeletal muscle fibers results from the

• transverse tubule pattern.

• sarcoplasmic reticulum network.

• sarcomere organization.

• cisternae placement.

A sarcomere is best described as

• a part of the sarcoplasmic reticulum.

• a group of fascicles.

• a group of muscle fibers.

• a unit within a muscle fiber.

The discoloration and swelling that occurs with a muscle strain is due to

• excess myofibrils.

• separated tendons.

• severed nerves.

• ruptured blood vessels.

Transverse tubules and sarcoplasmic reticulum are well developed in

• smooth muscle fibers.

• skeletal muscle fibers.

• cardiac muscle fibers.

• skeletal and cardiac muscle fibers.

Organize the following parts of a muscle from smallest to largest: muscle fiber, fascicle, myofibril, filament, muscle.

• Myofibril, filament, muscle, fascicle, muscle fiber

• Fascicle, filament, muscle fiber, myofibril, muscle

• Filament, myofibril, muscle fiber, fascicle, muscle

• Filament, muscle fiber, myofibril, fascicle, muscle

The functional unit of muscle contraction is

• the muscle.

• the muscle fiber.

• the myosin cross-bridge.

• the sarcomere.

Neurotransmitters are stored in vesicles in

• myofibrils.

• motor units.

• motor end plates.

• motor neuron endings.