Flashcards
Muscle Tissue
Flashcards do conjunto (61)
- 1What is the main function of muscle tissue?Contraction to generate motion (muscle must span a joint to achieve this)
- 2What does sarco- refer to?"muscle component"
- 3What does myo- refer to?"muscle component"
- 4Describe the activity of skeletal muscle.Strong, quick discontinuous voluntary contractions
- 5Describe the activity of cardiac muscle.strong, quick continuous involuntary contraction
- 6Describe the activity of smooth muscle.Weak, slow involuntary contraction
- 7How do skeletal muscle fibers develop?myoblasts --> fusion of myoblasts --> formation of muscle fiber
- 8_______ cells are the source of muscle regeneration after injury.Satellite
- 9_______ fuse to form a skeletal muscle fiber.Myoblasts
- 10Myofibrils contain microfilaments that contain ____ and ____ .actin, myosin
- 11What type of filament is actin: thin or thick?thin
- 12What type of filament is myosin: thin or thick?thick
- 13A Z line to Z line makes up a _____ .sarcomere
- 14____ band is made up of all myosin and a small amount of actin.A band
- 15Why does the A band have a dark band and a density that causes a darkness to the stain?High concentration of myosin
- 16This band is made up of all actin, which makes its stain light.I band
- 17This line is a density of protein that actin binds to on the A band. It's a scaffolding of the entire muscle fiber.Z line
- 18True/False: The Z line changes during contraction.False.
During contraction, the Z line pretty much doesn't change. - 19Coined as the leverage point of the entire muscle.Z line
- 20During contraction, a repetition binding-movement-release cycles between the ____ heads and ____ filaments occurs.myosin head
actin filaments - 21What ion plays a significant role in activation?Ca2+
- 22Where are calcium sacs stored in the muscle?sarcoplasmic reticulum
- 23What is a triad and what does it control?Special internal membrane system that controls muscle contraction by regulating calcium release.
- 24What are invaginations of the sarcolemma (plasma membrane) or a membrane-enclosed tube that goes down into the cell hundreds of times within a muscle cell?T-tubules
- 25Where do T-tubules occur in mammalian skeletal muscle?A/I junction
- 26What do t-tubules form with two terminal cisternae of the sarcoplasmic reticulum?triads
- 27How do triads at each A/I junction coordinate an impulse?Sarcomeres (Z line to Z line) must contract or relax at the same time
- 28How does an impulse run down the neuromuscular junction?1. Nerve impulse --> Ach released into synaptic cleft --> Ach binds to Ach receptor on sarcolemma of motor end plate --> triggering of muscle impulse
2. impulse spreads from sarcolemma to T-tubules --> Ca released from terminal cisternae of sarcoplasmic reticulum - 29Describe skeletal muscle: fibers? nuclei? fiber innervation?long, syncytial fibers
peripheral nuclei
fibers don't branch
each fiber is innervated - 30Describe cardiac muscle: fibers? nuclei? fiber innervation?cells attached end-to-end to form fibers
central nuclei
fibers branch
no innervation (stimulus spreads from cell-to-cell via Purkinje fiber coordination) - 31Where do T-tubules run in cardiac muscles?T-tubules run at Z-lines
- 32What is the difference in cardiac muscle t-tubules and muscle cells' t-tubules?Cardiac muscle's t-tubule is a diad instead of a triad like the muscle cell.
- 33____ _____ are modified cardiac myocytes interconnected by gap junctions (electrical synapses).Purkinje fibers
- 34Where can smooth muscle be found?Found in larger blood vessels, the GI system, ureter, bladder, reproductive systems and many other locations
- 35What type of muscle Controls peristaltic motions of tubular structures?smooth muscle
- 36Which part of a muscle cell is responsible for contraction?myofibrils
- 37The portion of the muscle cell that surrounds each muscle fiber by a small amount of connective tissue created by fibroblasts.Endomysium
- 38What provides nutrition to a muscle cell?capillaries
- 39This layer of the muscle cell surrounds the whole muscle.epimysium
- 40This layer of the muscle cell surrounds fascicles and bundles of muscle fibers.perimysium
- 41Where is the nucleus in a muscle cell?The nucleus is located at the cell's periphery (pushed off to the side).
- 42This layer of the muscle cell separates muscle fibers.Endomysium
- 43What functions as the cell boundary in the muscle cell?cell boundary
- 44In what layer do collagen fibers exist in a muscle cell?epimysium
- 45Identify the type of muscle tissue and indicate the stair-steps.Cardiac muscle tissue
&
intercalated disks
- 46Identify this muscle type and types of sections.Skeletal muscle tissue w/ striations at longitudinal and cross sections
- 47Identify the missing parts of this muscle cell.
- 48Identify the parts of the muscle fiber.
- 49Identify the organization of a skeletal muscle: epimysium, perimysium, endomysium, blood vessels, and capillaries.
- 50Identify the organization of a skeletal muscle.
- 51Identify myofibril, nucleus, sarcomere, connective tissue, and fibroblast.
- 52Identify.
- 53These indicate changes in band widths during contraction. Find contracted, rest length, and stretched.
- 54What does this picture indicate and in what type of muscle tissue?Muscle cell with motor end plates (arrows)
demonstrated by silver impregnation.
- 55Identify these parts of a skeletal muscle.
- 56Identify parts of the neuromuscular junction.
- 57Identify the parts of a cardiac muscle t-tubule system.
- 58—
- 59Name the parts of a smooth muscle contraction.
- 60Name the parts of the cardiac muscle associated with intercalated disks.
- 61Identify this tissue.Cardiac muscle
