Shared Flashcard Set

Details

muscle tissue
muscle tissue function
25
Anatomy
Undergraduate 2
04/08/2010

Additional Anatomy Flashcards

 


 

Cards

Term
basic characteristics of muscles 1.
Definition
electrial excitability
production of action potentials across the cellular membrane
Term
2. basic characteristcs of muscles
Definition
contractility
tension is created as muscle fibers shorten ( contract)
Term
3. basic characteristics
Definition
extensibility- ability of muscle fibers to be stretched with out damage
and still being able to contract while stretched
Term
4. characteristc of muscle
Definition
elasticity- ability of muscle fibers to spring back after contraction/extension
Term
sacrolema
Definition
motor end plate
received impulses from a motor neuron
ach receptors
Term
sacroplasm
Definition
cytoplasm, contains mitochondria which produce atp
lots of nuceli due to fusion of myoblasts
allows protein synthesis
Term
myofibrils
Definition
little threads
contain protein filaments(myofilaments)
Term
thick fibers
Definition
protein myosin( contractile) contain myosin tails point to filament midline(m-line)
forms shaft of filament
myosin heads
spiral around filament
point towards thinfilament
Term
myosin heads function
Definition
act as cross bridgesk for attachment of thin filaments during contraction
Term
thin filament
Definition
actin protein contain myosin binding sites to which myosin heads (cross bridges) can attach
Term
tropomyosin
Definition
covers myosin binding site of actin during muscle relaxation
Term
troponin
Definition
hold tropomyosin in place
Term
titan
Definition
anchors thick filaments to z discs
assist in recovery to resting postion
Term
myomesin
Definition
forms the m line on sarcomere
connects thick filaments
Term
nebulin
Definition
anchors thin filaments to z discs
Term
dystropin
Definition
attachs thin filaments to sacrolemma
Term
somatic motor neurons
Definition
carry impulse (action potential) to skeletal muscle from cns
stimulates muscle contraction
Term
motor unit
Definition
motor neuron and all myofibrils innervated by it used for precise movements large body movements
Term
neuromuscular junction
Definition
communication *synapse between motor neuron and myofiber
Term
axon terminals
Definition
branced ends of axon of somatic motor neuron
Term
synaptic vesicles
Definition
with in synaptic end bulbs contain ach
Term
synaptic cleft
Definition
space between axon and myofiber
Term
motor end plate
Definition
portion of muscle sacrolemma
contains ach receptors on integral proteins
ligand gated ion channels
Term
sacroplasmic reticulum
Definition
stores calcium released through calcium release channels
contains active calcium transport pump
actively pulls calcium into sr during relaxation
Term
hows does a muscle relax
Definition
by potassium gates opening and potassium rushing to the sacrolemma
ach is broken down by ache
calcium moves from sacroplasm to sr
myosin binding sites are covered again
Supporting users have an ad free experience!