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A&P.labmuscle
A&P.labmuscle.2008
| Question | Answer |
|---|---|
| myofibrils | one of the fine longitudinal fibrils occurring in a skeletal or cardiac muscle fiber - consists of regularly thick & thin myofilaments |
| actin myofilaments | THIN myofilaments - the "I" band - the light-colored section which has a Z disk in the middle & then the area on either side |
| Why is the light-colored band called the "I" band | Called the "I" band because of isotropic "iso" means "like" - the "I" band has properties which are the same in all directions |
| What is the "A" band? | the dark part of the sarcomere-it extends the length of the myosin myofilamnets within a sarcomere |
| Why is it called the "A" band? | It is Anisotropic "aniso" (meaning unequal, dissimilar, unalike) |
| sarcomere | functional unit of striated muscle [sarcom and G. meros "part"] |
| Z line | protein anchors the actin myofilaments [from Z to A] |
| how are myosin myofilaments held in place? | by TITIN filaments (which are springy) and the M line |
| neuromuscular junction | consists of the axon terminals and the area of the muscle fiber sarcolemma they innervate |
| what is another word for the synapse? | the neuromuscular junction - the functional membrane-to-membrane contact of the nerve cell with another nerve cell, an effector (such as a muscle cell) or a sensory receptor cell - synapse transmits nerve impulses through a club-shaped axon terminal |
| the axona terminal is the | PRE SYNAPTIC terminal |
| the synaptic cleft is | space between the axon terminal & the muscle fiber |
| the postsynaptic terminal | the muscle plasma membrane in the area of the junction is the posynaptic terminal, or the motor end-plate |
| what is another name for the postsynaptic terminal? | the motor end-plate |
| endomysium | on the inside-a delicate network of loose connective tissue with numerous reticular fibers which surround each muscle fiber |
| endo | G. endon = within - within, inner, absorbing, or containing |
| perimysium | a bundle of muscle fibers with their endomysium is surrounded by another, heavier connective tissue layer called the perimysium |
| epimysium | a muscle consists of many fasciculi grouped together & surrounded by a third and heavier layer, the epimysium- composed of dense, collagenous connective tissue and covers the entire surface of the muscle |
| epi | prefix meaning "on" "following" or "subsequent to" |
| fasicle | a band or bundle of fibers |
| tendon | L. tendo "to extend" remember "tendu" |
| tendon | a nondistensible fibrous cord or band of variable length that is the part of the muscle that connect the fleshy (contractile) part of muscle with its bony attachment or other structure |
| aponeurosis | fibrous sheet or flat, expanded tendon, giving attachment of muscular fibers ; serving as means of origin or insertion of a flat muscle- also serves as fascia for other muscles |
| origin of muscle | also called the "head" - Usually the most stationary part of the muscle |
| identify the microscopic slide of a tendon | |
| prime mover or agonist | the muscle accomplishing the movement, such as flexion |
| antagonist | the muscle acting in opposition to an agonist |
| synergist | members of a group of muscles working together to produce a maovement |
| fixator | muscles that hold one bone in place relative to the body where a more distal bone is moved Ex. scapula act as fixators to hold the scapula in place |
| what are the three types of muscle? | skeletal, cardiac & smooth |
| what types are voluntary? | skeletal |
| what types are involuntary | cardiac & smooth |
| where is smooth muscle found? | in stomach, intestines |
Created by:
walterina4327