neuromuscular junction muscle contraction and normal muscle tone Flashcards
absolute refractory period
depolarization
repolarization
refractory period
a time during which an organ or cell is incapable of repeating a particular action
relative refractory period
hyperpolarization
twitch
a single rapid contraction and relaxation of muscle fiber or group of muscle fibers
how many motor unit innervate a single muscle fiber
one
latent period
excitation-contraction-coupling
when does latent period begins
begins when action-potential cause depolarization in myocyte membrane
muscle tone
resistance felt by examiner
it is a partial state of contraction of a skeletal muscle to maintain its optimal length during resting
hypertonia
spasticity
rigidity
spasm
hypotonia
sloppy mushy feeling
classification of muscle tone
postural
phasic
muscle tone is regulated by;
spinal mechanism
supraspinal mechanism
spinal mechanism/control
- interaction between muscle spindle and spinal cord
- interneurons
supraspinal control
- via descending long tracts
- role of cerebellum
descending long traits
Inhibitory tracts -corticospinal and corticoreticular
Facilitatory tract - vestibulospinal and medial reticulospinal
