Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
anatomy
| Question | Answer |
|---|---|
| within muscle is innermost connective tissue layerthat surrounds each muscle cell fiber | endomysium |
| around muscle: surrounds bundles of muscle fibers called fascicles. dense irregular connective tissue that surrounds whole skeleton | perimysium |
| upon muscle: a layer of dense irregular connective tissue that surrounds whole skeletal muscle | epimysium |
| ___ stimulare muscle fibers to contract | moror neurons |
| highly ordered repeating units of myofilaments | sarcomeres |
| two strands of ___ form a double helix extending the length of the actin myofilament | F actin (fibrous) |
| ___: an elongated protein winds along the groove of the F actin double helix | tropomyosin |
| ___ is composed of 3 subunits: one that binds to actin, a second that binds to tropomyosin, and a third that binds to calcium ions | troponin |
| the _____ complex regulates the interaction between active sites on _____, _____ | tropomyosin/troponin complex, G actin, myosin |
| ___: filamentous network of protein. serves as attatchment for actin myofilaments | Z disk |
| from Z disks to ends of thick filaments | I bands |
| length of thick filaments | A bands |
| region in A band where actin and myosin don't overlap | H zone |
| middle of H zone, delicate filaments holding myosin in place | M line |
| in muscle fibers, __ and __ bands of parallel myofibrils are aligned | A and I |
| elastic chains of amino acids; make muscles extensible and elastic | tetin filaments |
| actin myofilaments sliding over myosin to shorten sarcomeres | sliding filament model |
| ___ system controls contraction through ____ ____ | nervous, action potentials |
| ligands are molecules that bind to receptors: ex: neurotransmitters | ligand-gated |
| open and close in response to small voltage changes across plasma membrane | voltage-gated |
| inside of plasma membrane becomes less negative. if change reaches threshold ___ occurs | depolarization |
| return of resting membrane potential. | repolarization |
| spread from one location to another. action potential doesnt move along the membrane; new action potential at each successive location | propagate |
| number of action potential produced per unit of time | frequency |
| ___ muscle: voluntary | skeletal |
| origin in primary motor ends | coricospinal neurons |
| extrapyramidal neurons: ___,___,___,___ | tectospinal, vestibulospinal, rubrospinal, reticulospinal origin |
| origin tectal region of midbraine | tectospinal |
| originin vestibular nuclei and cerebellum | vestibulospinal |
| origin in red nucleus of pons | rubrospinal |
| originin reticular formation of brain stem | reticulospinal |
| large type A myelinated nerves | spinal motor neurons |
| ventral horn of spinal cord | cell bodies |
| skeletal muscle fiber at the neuromuscular junction | final synapse |
| one sommatic motor neuron and all the skeletal muscle cells it stimulates | motor unit |
| one nerve cell supplies on average ___ muscle cells that all contract in unison | 150 |
| total strength of contraction depends on how ___ motor units are activated and how ___ the motor units are | how many,large |
| ___: axon terminal resting in an invagination of the sarcolemma. | synapse. |
| neuromuscular junction is made up of :. | presynaptic terminal, synaptic cleft, postsynaptic membrane (motor end plate). |
| ___: axon terminal with synaptic vesicles. | presynaptic terminal. |
| ____ blocks release of neurotransmitter at the NMJ so muscle contraction cannot occur | botulinum toxin |
| ____ is found in improperly canned food | bacteria (clostridum botulinum) |
| botulinum toxin: death occurs from paralysis of ____ | diaphragm. |
| derived from clostridum botulinum toxin | botox |
| plant poison used by s. american indians for poison arrows | curare |
| causes muscle paralysis by blocking ACh receptors, flaccid paralysis | curare |
| used to relax muscle during surgery | curare |
| antichoinesterase agent | neostigmine |
| blocks removal of ACh from receptors so strengthens weak muscle contractions of myasthenia gravis | neostigmine |
| antidote for curare after surgery is finished | neostigmine |
| inhibit Acherase, spastic paralysis of skeletal muscle | organophosphate |
| mechanism where an action potential causes muscle fiber contraction | excitation-contraction coupling |
| excitation-contraction coupling involves: | sarcolemma, transverse tubules, terminal cisternae, sarcoplasmic reticulum, triad, Ca2+, troponin |
Created by:
rchil967
Popular Anatomy sets