Prcatice 2: Muscle Structure

Ability to shorten with a force.

Ability to recoil to original resting length after being stretched.

Ability to be stretched.

The capacity to respond to a stimulus.

Muscle bundle.

Connective tissue that surrounds muscle fasciculi.

Connective tissue that surrounds a muscle fiber.

Connective tissue sheath that surrounds each skeletal muscle.

Single muscle cell; makes up muscle fasciculi.

Thick myofilaments which resemble bundles of golf clubs.

Provide calcium binding sites on actin myofilaments.

Thin myofilament which resembles two minute strands of

pearls twisted together.

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.

Highly organized, smooth endoplasmic reticulum; contains

high concentrations of calcium.

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

The cytoplasm of a muscle fiber.

The cell membrane of a muscle fiber.

perimysium

Epimysium

endomysium

fasciculi

myofibrils

the myofilament myosin

muscle fiber

the myofilament actin

z disk

myosin

actin

sarcomere