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Each muscle is an organ, comprised of skeletal muscle tissue, connective tissue, nervous tissue, and blood.


A sheet of fibrous connective tissue that encloses a muscle.


This connective tissue extends beyond the ends of the muscle and gives rise to tendons that are fused to the periosteum of bones.


Broad sheets of connective tissue that connects muscles. May attach to bone or to the coverings of adjacent muscles.


The layer of connective tissue around each whole muscle.


Connective tissue that surround individual bundles (fascicles) within each muscle.


A connective tissue layer that surrounds individual muscle fibers.


A bundle of muscle fibers.

Muscle fiber

A single, cylindrical muscle cell.


Plasma membrane of a muscle fiber.


The cytoplasm of a muscle fiber.


A long, filamentous organelle found within muscle fibers that has a banded appearance. A series of sarcomeres.


Thick filaments of myofibrils are made up of this protein.


Thin filaments of myofibrils are made up of this protein.


The organization of the thin and thick filaments produce striations. These striations form a repeating pattern of units along each muscle fiber called?


Extend from Z line - Z line.

I bands

Made up of actin filaments that are anchored to Z lines.

I bands

Another name for light bands.

A bands

Made up up overlapping thick and thin filaments.

A bands

Another name for dark bands.

H zone

In the center of A bands consisting of myosin filaments only.

M line

Bisect each H Zone; consists of proteins that help hold the thick filaments in place.

Z line

Dark zigzag line that bisects each light band (I band) and to which the thin filaments are attached.

Sarcoplasmic reticulum

Beneath the sarcolemma of a muscle fiber, membranous network of channels and tubules of a muscle fiber, corresponding to the endoplasmic reticulum of other cells.

Transverse tubules

Membranous channels that extend inward from a muscle fiber membrane.


Nerve cell

Motor neuron

A neuron that transmits impulses from the central nervous system to an effector.


The functional connection between the axon of a neuron and the dendrite or cell body of another neuron or the membrane of another cell type.


Chemicals that axons secrete on effectors (muscles or glands) or other neurons.


Muscles or glands that effect changes in the body.

Neuromuscular junction

Synapse between a motor neuron and a skeletal muscle fiber.

Motor end plate

Specialized part of a muscle fiber membrane at a neuromuscular junction.

Motor unit

A motor neuron and the muscle fibers that it controls constitute a what?


The attachment of a muscle's tendon to the stationary bone.


The attachment of a muscle tendon to a moveable bone.


The fleshy portion of the muscle between the tendons.


Assist the prime mover.

Prime mover

Muscle with the major responsibility for a certain movement. Also known as the agonist.


A muscle that relaxes while another contracts.


Prevents a bone from moving so that the prime mover can move another bone.


The support on or against which a lever rests, or the point about which it turns.


A rigid bar pivoted about a fulcrum.

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