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Muscle Vocab
muscle movements and parts
34
Anatomy
Undergraduate 1
03/11/2015

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Term
1) body movement
2) maintenance of posture
3) protection and support
4) storage and movement of material
5) heat production
Definition
5 Functions of Muscles
Term
1) excitability--the ability of skeletal muscle cells to respond to stimulation by the nervous system.
2) conductivity--involves an electrical change that travels along the plasma membrane of the skeletal muscle cell.
3) contractility--exhibited when contractile proteins within the muscle cells slide past each other, causing the muscle to shorten.
4) elasticity--specialized protein fibers within the skeletal muscles cells act like compressed coils when a muscle contracts.
5) extensibility--the lengthening of a muscle cell.
Definition
5 Characteristics of Muscles
Term
Epimysium
Definition
The layer of dense irregular connective tissue that surrounds the whole skeletal muscle.
Term
Perimysium
Definition
The dense irregular connective tissue that surrounds fasicles.
Term
Endomysium
Definition
The innermost connective tissue layer.
Term
Fascicles
Definition
Bundles of muscle fibers.
Term
Muscle fibers
Definition
Muscle cells that run the entire length of the muscle.
Term
Tendon
Definition
A thick, cord like structure that is composed of dense regular connective tissue. They attach the muscle to bone, skin, and other muscle.
Term
Aponeurosis
Definition
Connective tissue that forms a thin, flattened sheet of dense irregular tissue.
Term
Motor unit
Definition
A single motor neuron and the muscle fibers it controls.
Term
Sarcoplasm
Definition
The cytoplasm of muscle fibers.
Term
Sarcolemma
Definition
The plasma membrane of a skeletal muscle fiber.
Term
Aponeurosis
Definition
Connective tissue that forms a thin, flattened sheet of dense irregular tissue.
Term
Motor unit
Definition
A single motor neuron and the muscle fibers it controls.
Term
Sarcoplasm
Definition
The cytoplasm of muscle fibers.
Term
Sarcolemma
Definition
The plasma membrane of a skeletal muscle fiber.
Term
T-Tubules
Definition
Deep invaginations of the sarcolemma that extend into the skeletal muscle fibers as a network of narrow membranous tubules.
Term
Sarcoplasmic Reticulum
Definition
Similar to the ER of other cells.
Term
Terminal Cisternae
Definition
Located at either end of the sarcoplasmic reticulum. Much like the hem of a sleeve. Serve as the reservoirs for calcium ions.
Term
Myofibrils
Definition
80% of the muscle fiber is composed of these long, cylindrical structures.
Term
Myofilaments
Definition
Each myofibril contains bundles of muscle protein called this.
Term
Myosin
Definition
Make up thick filaments.
Term
Actin
Definition
Make up thin filaments
Term
Tropomyosin
Definition
Associated with thin filaments. Short, thin, twisted, "string-like" protein.
Term
Troponin
Definition
Associated with thin filaments. Globular or "ball like" protein attached to tropomyosin. Binding site for calcium ions.
Term
Sarcomere
Definition
Myofilaments within myofibrils arranged in repeating microscopic cylindrical units.
Term
I Band
Definition
Bisected by Z discs. Disappear at full muscle contraction.
Term
A Band
Definition
Made up of thick filaments. Partially overlap.
Term
H Zone
Definition
Most central portion of the A band in a resting sarcomere. Does not have thin filament overlap. Only thick filaments are present. Disappear during muscle contraction.
Term
M Line
Definition
Protein meshwork in the center of the H zone. Serves as the attachment site for the thick filaments. Keeps thick filaments in line while contraction and relaxation occur.
Term
Synaptic knob
Definition
Where the axon nears the sarcolemma of a muscle fiber, this part enlarges and flattens to cover a relatively large surface area.
Term
Synaptic Vesicles
Definition
Located in the synaptic knob cytosol. Small membrane sacs filled with ACh.
Term
Synaptic Cleft
Definition
A narrow fluid filled space separating the synaptic knob and the motor end plate. The enzyme AChE resides there to break up ACh.
Term
Motor End Plate
Definition
The specialized region of the sarcolemma of a muscle fiber. It has numerous folds to increase surface area. Contain vast numbers of ACh receptors.
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