Chapter 9 Flashcards
(60 cards)
Skeletal muscle helps in what?
Muscle movement
Contracility
the ability of muscle to shorten forcefully or contract
Where is smooth muscle found
walls of hollow organs, blood vessels, eyes, glands, and skin
What do multinucleated cells generally develop from
myoblasts
What is the membrane that surrounds each fasiculus
the perimyseum
What does the endomyseum surround
the entire muscle
Actin (thin) filaments
two strands of fibrous actin form a double helix extending the length of the filament
is made up of globular G protein
The traponin is the _____ that has a ______ binding site
trigger calcium
ATPase is found where
the myosin (thick filament) heads
ATPase does what
breaks ATP into ADP+P+energy
The sarcolema is another name for what
cell membrane of a muscle
Charged battery has potential energy. Potential means the same as what
Polarized
Dead battery has no potential energy. No potential is the same as
depolarized
The prefix “Iso-“ means what
the same
A muscle cell is the same as what
muscle fiber
Other names for muscle cell membrane are
cell membrane
sarcolema
motor end plate
Where does a resting membrane potential exist
in a resting muscle fiber
Voltage gated channels
open & close in response to small voltage changes across the plasma membrane
Ligand gated channels
glycoprotein with a receptor site
Depolarization
inside of plasma membrane becomes less negative. If charge reaches threshold depolarization occurs
Repolarization
return of resting membrane potential
Threshold
value of the membrane potential at which an action potential is produced as a result of depolarization in response to a stimulus
What neurotransmitter is found at neuromuscular junction
acetylcholine
Acetylcholine is broken down by what
acettylcholinesterase
