Vocabulary Quiz 6 Flashcards
Thin filaments are anchored to Z discs. Their main component is the protein ____. Individual ____ molecules join to form an _____ filament that is twisted into a helix
Actin
An energy-rich molecule found in muscle fibers
Creatine Phosphate
A chronic, painful, nonarticular rheumatic disorder that affects the fibrous connective tissue components of muscles, tendons, and ligaments.
Fibromyalgia
Same length contraction; not moving anything.
Isometric Contraction
Some tension contraction; length changes, moving something.
Isotonic Contraction
A chemical produced by the body in your muscles during exercise.
Lactic Acid
Region of the sarcolemma of a muscle fiber (cell) that includes acetylcholine(ACh) receptors, which bind ACh released by synaptic end bulbs of somatic motor neurons
Motor End Plate
A motor neuron together with the muscle fibers it stimulates.
Consists of a somatic motor neuron plus all of the skeletal muscle fibers it stimulates.
Motor Unit
Bundle of muscle fibers wrapped in perimysium.
Muscle Fascicle
A sustained, partial contraction of portions of a skeletal or smooth muscle in response to activation of stretch receptors or a basline level of action potentials in the innervating motor neurons.
Muscle definition; muscles are more contracted at rest for athlete than non athlete.
Muscle Tone
Inherited muscle destroying diseases, characterized by degeneration of muscle fibers, which causes progressive atrophy of the skeletal muscle.
Muscular Dystrophy
Weakness and fatigue of skeletal muscles cause by antibodies directed against acetylcholine receptors.
An autoimmune disease that causes chronic, progressive damage of the neuromuscular junction.
Myasthenia Gravis
Threadlike structuresextending longitudinally through a muscle fiber consisting mainly of thick filaments and thin filaments
Myofibril
The oxygen-binding, iron-containing protein present in the sarcoplasm of muscle fibers; contributes the red color to muscle
Myoglobin
The contractile protein that makes up the thick filaments of muscle fibers
Myosin
A synapse between the axon terminals of a motor neuron and the sarcolemma of a muscle fiber
Neuromuscular Junction
After death, the resulting condition in which muscles are in a state of rigidity (cannot contract or stretch).
Rigor Mortis
A contractile unit in a striated muscle fiber extending from one Z disc to the next Z disc
Filaments inside a myofibril are arranged in compartments called ______. They are the basic functional units of the myofibril.
Sarcomere
A fluid-filled system of membranous sacs called ____ encloses each myofibril.
A network of saccules and tubes surrounding myofibrils of a muscle fiber, comparable to endoplasmic reticulum; functions to reabsorb calcium ions during relaxation and to release them to cause contraction
Sarcoplasmic Reticulum
Muscles not allowed to relax.
Tetanus
As muscular tissue contracts, it produces heat.
Thermogenesis
Narrow, plate-shaped regions of dense protein material called ____ separate one sarcomere from the next.
Z Disc
