Module 8 Flashcards
what are the 4 characteristics of muscle tissue
excitability
contractility
extensibility
elasticity
excitability
muscle tissue has the capacity to respond to the stimulation of nervous impulses or hormones
contractility
shorten or contract with force
extensibility
can stretch beyond (within reason) resting length
elasticity
returns (recoils) to resting length after being stretched
what are the 5 key functions of muscle
produces body movements
stabilizes body positions
regulates organ volume
moves substances within the body
generates heat
superficial fascia
subcutaneous layer
separates muscle from skin
functions to provide a pathway for nerves and blood vessels
stores fat
insulates
protects muscles
deep fascia
lines the body wall and limbs and holds muscles with similar functions together
allows for the free movement of muscles
carries nerves, blood vessels, lymph vessels,
fills spaces between muscles
skeletal muscle fibres arise from
myoblasts
skeletal muscle consists of
fibres (cells) covered by sarcolemma
t-tubules
tiny invaginations of the sarcolemma that quickly spread the muscle action potential to all parts of the muscle fibre
sarcoplasm
muscle cell cytoplasm
contains large amounts of glycogen for energy production and myoglobin for oxygen storage
each fibre contains
myofibrils
consist of thick and thin filaments (myofilaments) arranged in units called sarcomeres
sarcomeres
the basic functional units of a myofibril and show distinct dark (A band) and light (I band) areas.
a Z disc passes through the centre of the I band
myosin
main component of thick filaments
function as motor protein
