Prcatice 2: Muscle Structure

Ability to be stretched.

The capacity to respond to a stimulus.

Ability to recoil to original resting length after being stretched.

Ability to shorten with a force.

Connective tissue sheath that surrounds each skeletal muscle.

Connective tissue that surrounds muscle fasciculi.

Single muscle cell; makes up muscle fasciculi.

Muscle bundle.

Connective tissue that surrounds a muscle fiber.

Covers and uncovers attachment sites for myosin on actin

myofilaments.

Thread-like structure that extends from one end of the muscle

fiber to the other.

Thin myofilament which resembles two minute strands of

pearls twisted together.

Provide calcium binding sites on actin myofilaments.

Thick myofilaments which resemble bundles of golf clubs.

The cytoplasm of a muscle fiber.

The cell membrane of a muscle fiber.

Invaginations (indentions) of the sarcolemma that wrap around sarcomeres.

Highly organized, smooth endoplasmic reticulum; contains

high concentrations of calcium.

endomysium

perimysium

Epimysium

muscle fiber

fasciculi

myofibrils

the myofilament myosin

the myofilament actin

actin

sarcomere

z disk

myosin