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muscular tissue
chapter 11
26
Anatomy
Graduate
06/24/2011

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Term
muscle fibers
Definition
has transverse (t) tubules
Term
functions of t tubules
Definition
carry electric current from surface to interior of cell where it stimulates terminal cisternae to release calcium
Term
sarcoplasmic reticulum
Definition
calcium storage organelle
Term
sarcoplasm
Definition
contains glycogen (stored energy) and myoglobin ( binds oxygen)
Term
myofilaments
Definition
central to muscle contraction
Term
thick myofilaments
Definition
made of myosin shaped like a golf club
Term
thin myofilaments
Definition
made up of actin. each has active site that can bind the head of myosin molecule
Term
tropomyosin and troponin
Definition
regulatory protein of muscle contraction
Term
sacromere
Definition
unit of contraction of muscle fiber
Term
skeletal muscle
Definition
innervated by somatic motor neurons
Term
motor unit
Definition
consists one nerve fiber and all the muscle fibers it innervates
Term
synapse
Definition
point of contact between neuron and its target cell
Term
neuromusclar junction
Definition
target cell is muscle cell synapse
Term
neuromuscular junction
Definition
neurotransmitter is always acetylcholine(ach) also present is acetylcholinesterase that breaks down ach after stimulation
Term
electrophysiology
Definition
study of electrical activity of cells
Term
resting membrane potential
Definition
RMP; stable voltage across plasma membrane of unstimulated cell
Term
action potential
Definition
rapid voltage change in which plasma membrane briefly reverse polarity
Term
treshold
Definition
minimal voltage necessary to produce a muscle contraction
Term
twitch
Definition
cycle of muscle contraction and relaxation after a single, brief stimulus
Term
latent period
Definition
period of time when a muscle will not contract after 2 successive twitches
Term
muscle fatigue
Definition
progressive and loss of contractility
Term
oxygen debt
Definition
difference between resting state of oxygen consumption and elevated rate following exercise
Term
fast-twitch fibers
Definition
large; used for stop-and-go activities; have a white appearance
Term
slow-twitch fibers
Definition
small; are high endurance fibers; have dark appearance
Term
muliunit smooth muscle
Definition
terminal branch of an axon synapse with individual muscle cells and form motor unit
Term
single-unit smooth muscle
Definition
nerve fiber does not synapse with particular cell but rather releases neurotransmitter at several point within tissue
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