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What are the functions of the system?
the site where motor neuron and muscle fiber meet
The neuromuscular junction parts in order of impulse transmission are:
What is the role of acetylcholinesterase?
is the space
Motor end plate(MEP)
--> modified sarcolemma--
contains ACh receptors
is an acethylcholine degrading enzyme.
The Functional unit of the Muscular System?
Sarcomere--> the smallest functional unit
The components of Sarcomere are:
--is made of
and attached to
-- is made of
Define Sliding Filament Theory & what must be supplied to promote relaxation?
Sliding Filament Theory
is when the
actin and mysoin bind
over thick filaments
Requirement for relaxation is ATP.
Define Motor Unit---all-or-none law and recruitment
is motor neuron & all muscle fibers it stimulates
is when the maximum contraction of all fibers in the motor unit.
is increased motor units and increased contraction force
Define Twitch and Tetanus
is a rapid response of a muscle fiber to a threshold stimulus.
is substaned contraction due to rapid stimulation and summation of twitches (prolonged contraction of skelectal muscles)
and what is
is the period which a threshold stimulus produces no response.
length = short
is aerobic metabolism without interruption for long periods of time. This promotes physical fitness.
is the ability to do work.
This is overwhelmingly related to changes in skelectal muscles (not heart or lungs) that allow it to use oxygen more efficiently.
Major functions of skeletal muscles on outline:
: rectus adominis, external oblique, internal oblique
Upper Extremity at shoulder
Lower extremity at hip & knee
----sartorius (flexes at hip & knee)
----quadriceps group (extend at knee)
-----gluteus maximus (extends at hip)
-----hamstrings group (extends at hip, flexes at knee)