This quiz titled 'Skeletal Muscle: Micro Anatomy' explores the intricate details of muscle fiber structure and function, focusing on neuromuscular junctions, nuclei placement, Z-lines, transverse tubules, and genetic factors affecting muscle performance. It assesses understanding vital for students of biology and medical sciences.
Sarcomeres.
Transverse tubules.
Sarcoplasmic reticulum
Z-lines.
Thick filaments,
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T tubules are located at the Z disk
T tubules are absent
Troponin is absent
It possesses triads
It possesses caveolae
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They are located in the Z disk
They consist of two terminal cisternae of the sarcoplasmic reticulum separated by a T tubule
They can be observed with the light microscope
They are characterized by a T tubule that sequesters calcium ions
They consist of two T tubules separated by a central terminal cisterna
Length of the muscle
Number of motor units activated
Peak intracellular calcium concentration in the muscle
Strength of each cross-bridge interaction with actin
Maximum shortening velocity of the muscle
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Differentiation of satellite cells
Dedifferentiation of myocytes into myoblasts
Fusion of damaged myofibers to form new myotubes
Hyperplas ia of existing myofibers
Differentiation of fibroblasts to form myocytes
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Cellular Ca++ storage
Cellular glycogen storage
Glycogen degradation
Transport of Ca++ into the terminal cisternae during muscle contraction
Ca++ release from the transverse tubules during muscle relaxation
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Can be cleaved into light and heavy myoglobin by the proteolytic enzyme papain
Are attached to the Z line by a-actinin
Each has a head component that includes an actin-binding site
Can shorten to half their resting length during contraction
Have tail components that overlap In the I band
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Botulinum toxin
Muscanne
Atropine
Curare
Pyridostiqmine
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Myofilament, myofibril, fiber, fascicle
Fiber, myofibril, myofilament, fascicle
Fascicle, fiber, myofilament, myofibril
Fascicle, fiber. myofibril, myofilament
Fiber. myofibril. fascicle, myofilament
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Thick filaments (myosin)
Thin filaments (actin)
T-tubules
Sarcoplasmic reticulum
Neuromuscular junctions
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Endomysium
Epimysium
Fascia
Perimysium
Sarcoplasmic retinaculum
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Long fiber has a higher velocity during isotonic contraction than the short one
Long fiber has a higher velocity during isometric contraction than the short one
Long fiber has a lower velocity during isotonic contraction than the short one
Long fiber has a lower velocity during isometric contraction than the short one
Both fibers have the same velocity during isotonic contraction
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Are found only in cardiac muscle
Are largest in muscles responsible for delicate movements
Consist of a muscle fiber and all the nerves that supply it
Consist of a motor neuron and all the muscles it supplies
Are the same as myoneural junctions
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Midway along the length of the muscle fiber,
Spaced at regular intervals along each muscle fiber
Spaced at irregular intervals along each muscle fiber.
Near the proximal end of a muscle fiber.
Near the distal end of a muscle fiber.
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Individual muscle fibers
Muscle fascicles
Individual myofibrils
An entire muscle
Small bundles of muscle cells
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T tubule, terminal cisternae, sarcoplasmic retinaculum, sarcolemma
Sarcoplasmic retinaculum, T tubule, presynaptic membrane, sarcolemma
Terminal cisternae, sarcolemma, sarcoplasmic retinaculum, caveolae
Sarcolemma, T tubule, terminal cisternae, sarcoplasmic retinaculum
Sarcolemma, sarcoplasmic retinaculum, T tubule, terminal cisternae
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Midway along the length of the muscle fiber
Spaced at regular intervals along each muscle fiber.
Spaced at irregular intervals along each muscle fiber
Near the proximal end of a muscle fiber,
Near the distal end of a muscle fiber.
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To block the Ca++ ATPase activity of cell membrane
To block the Ca++ ATPase activity of scarcoplasmic membrane
To increase the Ca++ entry through DHP receptors
To increase Ca++ release through ryanodin receptors
To increase the activity of Ca++/3Na+ exchanger
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A mutation in the voltage sensuive K+ channel of skeletal muscle
Elevated PIP2 in skeletal muscle
Depressed PIP2 and elevated IP3 in gamma-motoneurons of the penpheral nerves
A mutation in acetylcholine esterase
A mutation in the voltage sensitive Ca2+ channel of skeletal muscle
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Are evaginations of the sarcoplasmic retinaculum
Sequester calcium ions during muscle relaxation
Carry repolarization to the muscle fiber interior
Are found overlying the A-I band junction in cardiac muscle cells
Contain a rich supply of acetylcholine receptors
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