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wellman eastham

muscle note cards

QuestionAnswer
4 characteristics of muscles Contracility, Excitability, Extensibility, elasticity
ability of muscle to shorten with force contractility
capacity of skeletal muscle to respond to stimulus excitability
ability to be stretched extensibility
abililty to recoil to their original resting length after being stretched elasticity
muscle helps to produce heat
muscles help regulate and keep a normal? body temoperature
skeletal muscle that is surrounded by a connective tissue sheath epimysium
connective tissue outside the epimysium fascia
a muscle is composed of numerous visible bundles called fascicle
fascicles are surrounded by a connective tissue called perimysium
fasciculi are composed of single muscle cells called fibers
each fiber is surrounded by a connective tissue sheath called endomysium
the cytoplasm of each fiber is filled with myofibrilis
a threadlike structure that extends from one end of the fiber to the other myofibrils
2 types of myofibril protein fibers actin myofilaments, myosin myofilaments
thin myofilaments that resemble pearls twisted together actin myofilaments
thick myofilaments that resemble bundles of minute golf clubs myosin myofilaments
actin and myosin myofilaments form highly ordered units called sarcomeres
basic structural and functional unit of the muscle sarcomere
the charge difference across the membrane is called resting membrane potential
the brief reversal back of the charge is called action potential
nerve cells that carry action potentials to skeletal muscle fibers are motor neurons
each branch that connects to the muscle forms a neuromuscular junction or synapse
a single motor neuron and all the skeletal muscle fibers it innervates are called motor units
an enlarged nerve terminal is called presynaptic terminal
the space between the presynaptic terminal and the muscle cell is presynaptic cleft
the muscle fiber after the synaptic cleft is postsynaptic terminal
each presynaptic terminal contains synaptic vesicles
the neurotransmitter is acetycholine
the acetylcholine is released into the synaptic cleft between the neuron and muscle cell is broken down by enzymes called acetylcholinesterase
when does muscle contraction occur? when actin and myosin myofilaments slide past one another causing sarcomeres to shorten
the sliding of actin myofilaments past myosin myofilaments during contraction is called sliding filament mechanism
a cintraction of an entire muscle in repsonse to a stimulus muscle twitch
the point at which the muscle fiber will contract maximally threshold
the phenomenon which deals with the muscles full contraction is all or none response
the time between application of a stimulus to a motor neuron and the beginning of a contraction is called lag phase
4 characteristics of muscles Contracility, Excitability, Extensibility, elasticity
ability of muscle to shorten with force contractility
capacity of skeletal muscle to respond to stimulus excitability
ability to be stretched extensibility
abililty to recoil to their original resting length after being stretched elasticity
muscle helps to produce heat
muscles help regulate and keep a normal? body temoperature
skeletal muscle that is surrounded by a connective tissue sheath epimysium
connective tissue outside the epimysium fascia
a muscle is composed of numerous visible bundles called fascicle
fascicles are surrounded by a connective tissue called perimysium
fasciculi are composed of single muscle cells called fibers
each fiber is surrounded by a connective tissue sheath called endomysium
the cytoplasm of each fiber is filled with myofibrilis
a threadlike structure that extends from one end of the fiber to the other myofibrils
2 types of myofibril protein fibers actin myofilaments, myosin myofilaments
thin myofilaments that resemble pearls twisted together actin myofilaments
thick myofilaments that resemble bundles of minute golf clubs myosin myofilaments
actin and myosin myofilaments form highly ordered units called sarcomeres
basic structural and functional unit of the muscle sarcomere
the charge difference across the membrane is called resting membrane potential
the brief reversal back of the charge is called action potential
nerve cells that carry action potentials to skeletal muscle fibers are motor neurons
each branch that connects to the muscle forms a neuromuscular junction or synapse
a single motor neuron and all the skeletal muscle fibers it innervates are called motor units
an enlarged nerve terminal is called presynaptic terminal
the space between the presynaptic terminal and the muscle cell is presynaptic cleft
the muscle fiber after the synaptic cleft is postsynaptic terminal
each presynaptic terminal contains synaptic vesicles
the neurotransmitter is acetycholine
the acetylcholine is released into the synaptic cleft between the neuron and muscle cell is broken down by enzymes called acetylcholinesterase
when does muscle contraction occur? when actin and myosin myofilaments slide past one another causing sarcomeres to shorten
the sliding of actin myofilaments past myosin myofilaments during contraction is called sliding filament mechanism
a cintraction of an entire muscle in repsonse to a stimulus muscle twitch
the point at which the muscle fiber will contract maximally threshold
the phenomenon which deals with the muscles full contraction is all or none response
the time between application of a stimulus to a motor neuron and the beginning of a contraction is called lag phase
the time of contraction is the contraction phase
the time during which muscle relaxes is the relaxation phase
when the muscle remians contracted without relaxing is called tetany
the increase in the number of motor units being activated is recruitment
what is neeeded for energy for muscles to contract? ATP
ATP is produced in the mitochondria
what does ATP stand for? adenosine triphosphate
what does ADP stand for? adenosine diphosphate
wihtout oxygen? anaerobic respiration
with oxygen aerobic respiration
equal distance isometric
equal tension isotonic
constant tension produced by muscles of the body for long periods of time muscle tone
contract quickly and fatigue quickly fast twitch fibers
contract more slowly and are more resistant to fatigue slow twitch fibers
Created by: jakewellman