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this type of muscle tissue pushes liquids and solids throughout the digestive system and regulates the openings of arteries
Postural/Skeletal Movement, Maintain Posture, Protect and Support other Soft Tissue, Control Openings into the Body, Maintain Body Temperature, Store Nutrients
what are the 6 functions of skeletal muscle?
this function of skeletal muscle produces contractions that pull on tendons, which move the body
this function of skeletal muscle creates constant tension in resting muscles that maintain the body position, whether sitting or standing.
Protect and support other soft tissue
this function of skeletal muscle supports the weight of the visceral organs and shields them from injury.
control openings into the body
this function of skeletal muscle creates circular muscles sphincters that control openings to the urinary and digestive systems.
maintain body temperature
this function of skeletal muscle describes the amount of energy needed for a muscle to contract. this produces a large amount of heat
the organization of skeletal muscles is made up of 3 layers of connective tissue that support each muscle and comprise of the
this layer is made up of elastic connective tissue that surrounds each muscle fiber.
it contains muscle fibers, capillaries, neurons, and satellite cells
this layer surrounds many muscle fibers and bundles them into fasicles bundles of muscle fibers
this layer bundles together all fasicles and separates muscles from other muscles and organs
all 3 connective tissue layers extend beyond the ends of the muscle fibers and combine to form THIS
this is a part of the muscle fiber that is the cell membrane of a muscle fiber. It is excitable (able to conduct an electrical impluse)
this is a part of the muscle fiber that are hallow tubes that pass through the sarcoplasm from the sarcolemma.
they can also carry electrical impulses from the sarcolemma into inter of the cell.
this is a part of the muscle fiber that are long organelles that fill the muscle cell.
they contain tiny strands of contracile proteins called actin and myosin
they are responsible for cell contraction
this is a part of the muscle fibers that is a system of membranes. In this, each myofibril is wrapped.
This stores calcium ions used for muscle cell contractions
they are encircled by t-tubules and carry electrical impulses.
this is a part of a muscle fiber that conducts the actual contracting unit of a myofibril.
this is created by the interactions between thick and thin filaments with the sarcomeres
this thin filament contains 2 large, twisted, strands attached to a Z line. It contains active sites that bind with myosin
this thin filament contains a double stranded molecule attached to actin. It contains protein molecules called troponin
this thin filament binds tropomyosin to active sites on actin, which prevents contractions. It is controlled by calcium ions
this part of myosin binds to active sites on active, which forms cross bridges.
this also pivots and provides movement
this is a specialized connection between the nervous system and a skeletal muscle fiber.
this part of a neuron is a chemical messenger that is produced in the synaptic terminal and furthermore stores in vesicles
they are released by neurons.
they allow for communication with another cell
motor end plate
this part of a neuron is a region on the muscle fiber sarcolemma.
it receives the signal from a motor neuron
this part of a neuron is the gap between the synaptic terminal and the motor end plate
this part of a neuron is the electrical impluse. it travels along the neruon's axon to the synaptic terminal. the synaptic terminal eleases acetylcholine into the synaptic cleft, which flows and binds to receptors on the motor end plate.
THIS is generated along the entire muscle fiber sarcolemma and into the t tubules
this occurs when a muscle fiber contracts.
the total amount of this produced in the whole muscle depends on the total number if muscle fibers contracting
this is all of the muscles controlled by a single motor neuron
this is equal to a motor neuron + all of te muscle fibers controlled by it
rest and recover
during a sustained contraction, motor united are activated on a rotating basis.
this allows fibers to do this
stability (of muscles and bones), fast recruitment (because some motor units are already stimulated), and weight loss (as toned muscles use more energy to help burn more calories)
what are the three benefits of muscle tone?
this type of muscle contraction states that as tension change, muscle length changes
concentric isotonic contraction
this is a type of isotonic contraction where the muscle tension exceeds the resistance and the muscle SHORTENS
this is a type of isotonic contraction where the muscle tension equals the resistence. there is NO CHANGE in muscle length.
contraction speed: very quick, but strong
Fiber size: large diameter
Fatigue resistance: fatigues quite quickly
Energy production: large reserves of glycogen that store glucose which is used for the rapid production of anerobic ATP.
phasic muscles provide movement
contraction speed: very slow
fiber size: small fiber diameter and weak contraction
fatigue resistance: high resistance (can last for hours)
energy product: large amounts of myoglobin, which is a red pigment that binds oxygen to ATP for aerobic production.
contraction speed: fairly fast
fiber size: intermediate
fatigue resistance: intermediate
energy production: aerobic and anerobic
this color of muscle fibers is made up of mostly fast fibers and is pale in color
Ex: chicken breast
this is the type of muscle growth that occurs from increased exercise. It increases the muscle diameter and number of myofibrils
this is the type of muscle growth that causes muscle loss from decreased exercise. It causes a decrease in muscle fiber diameter and number of myofibrils. It causes reduced tone and power.
this is the term that describes the movement produced by the muscle.
Examples include flexion, extension, abduction, etc.
this is the term that describes the muscle that stretches to allow the agonist to perform its action
muscles of expression
Occipitofrontali, obicularis oculi, orbicularis oris, buccinator, zygomatic major, zygomatic minor, platsmus make up this type of muscle
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