the muscular system Flashcards
How much of the body is made up with skeletal muscle
40-50% of total body weight
cardiac muscle
striated
only found in the heart
develops pressure for arterial blood flow
smooth/visceral muscle
involuntary
non-striated
grouped in walls of hollow organs
maintain diametral of organs/vessels
moves material in GI, urinary and reproductive tracts
name the 5 muscle function
production of body movements
stabilisation of body positions (posture)
regulation of organ volume
movement of substances internally
production of heat
what does the muscle tissue include
muscle fibres
connective tissue
nerve and blood vessels
what is the muscle wrapped in
epimysium
a sheath of fibrous elastic tissue surrounding a muscle
what surrounds the fibre bundles in muscles
perimysium
its called fascicles
what surrounds each fibre in fibre bundles in muscles
endomysium
what is the sarcolemma?
plasma membrane
what is the transverse (T-tubules)
membrane extensions from surface to centre of each fibre
where would the multiple nuclei be located
near the surface
what are the thick filaments called?
myosin
what does the thick filaments do
has moveable heads
what are the thin filaments called?
actin
what do the thin filaments do
anchored to Z-discs
contain myosin binding sites for myosin head
also contain tropomyosin & troponin
